I keep this brief, this mod adds 107 lore-based Mech variants to the game:

• Flea FLE-4
• Flea FLE-14
• Flea FLE-16
• Locust LCT-1Vb
• Locust LCT-3M
• Locust LCT-3D
• Hornet HNT-151
• Hornet HNT-152
• Hornet HNT-161
• Hornet HNT-171
• Commando COM-5S
• Mongoose MON-66
• Mongoose MON-66b
• Mongoose MON-67
• Mongoose MON-69
• Mongoose MON-70
• Spider SDR-7M
• UrbanMech UM-R63
• SuburbanMech UM-90
• SuburbanMech UM-100
• Valkyrie VLK-QA
• Valkyrie VLK-QF
• Valkyrie VLK-QD
• Javelin JVN-11A
• Javelin JVN-11B
• Panther PNT-9ALAG
• Panther PNT-10K
• Wolfhound WLF-2
• Raven RVN-3M
• Clint CLNT-1-2R
• Clint CLNT-2-3T
• Clint CLNT-2-3T "Denton"
• Clint CLNT-2-3U
• Clint CLNT-2-4T
• Cicada CDA-3F
• Vulcan VT-5M
• Vulcan VT-5S
• Assassin ASN-23
• Vindicator VND-3L
• Phoenix Hawk PXH-3D
• Phoenix Hawk PXH-3M
• Phoenix Hawk PXH-3K
• Blackjack BJ-2
• Hunchback II HBK-2
• Enforcer ENF-5D
• Trebuchet TBT-5S
• Dervish DV-6Md
• Griffin GRF-1DS
• Shadow Hawk SHD-2Hb
• Shadow Hawk SHD-2Ht
• Shadow Hawk SHD-5S
• Wolverine WVR-7D
• Wolverine WVR-7K
• Wolverine WVR-7M
• Jagermech JM6-DG
• Champion CHP-3N
• Grand Dragon DRG-5K
• Crusader CRD-6D
• Crusader CRD-6T
• Rifleman RFL-5D
• Rifleman RFL-5M
• Thunderbolt TDR-7M
• Thunderbolt TDR-9S
• Thunderbolt TDR-5Sb
• Catapult CPLT-K3
• Catapult CPLT-C4C
• Archer ARC-4M
• Archer ARC-5S
• Archer ARC-5R
• Archer ARC-5W
• Archer ARC-5CS
• Orion ON1-MA
• Warhammer WHM-6Rk
• Warhammer WHM-7K
• Warhammer WHM-7M
• Warhammer WHM-7S
• Warhammer WHM-7CS
• Marauder MAD-5M
• Marauder MAD-5S
• Marauder MAD-5CS
• Black Knight BL-9-KNT
• Cataphract CTF-3L
• Cataphract CTF-3D
• Zeus ZEU-6A
• Zeus ZEU-9S2
• Thug THG-10E
• Thug THG-11E
• Thug THG-11Eb
• Awesome AWS-9Q
• Hatamoto-Hi HTM-27U
• Hatamoto-Mizo HTM-27Y
• Charger CGR-1A9
• Battlemaster BLR-1Gb
• Battlemaster BLR-3S
• Banshee BNC-3Q
• Banshee BNC-5S
• Nightstar NSR-9FC
• Stalker STK-5S
• Stalker STK-5M
• King Crab KGC-001
• King Crab KGC-010
• Marauder II MAD-5B
• Marauder II MAD-5C
• Atlas AS7-S
• Atlas AS7-A
• Atlas II AS7-D-H
• Atlas II AS7-D-H2
  

4.51
- Overhauled Hornet
- Fixed minor graphical glichtes with Clint

4.5
- Added CLNT-1-2R, CLNT-2-3T, CLNT-2-3T "Denton", CLNT-2-3U and CLNT-2-4T

4.3
- Compatibility with patch 1.1.1355

4.2
- Compatibility with patch 1.1.1322

4.1
- Compatibility with patch 1.1.344

4.0
- Compatibility with patch 1.1.338

3.9
- Added Shadow Hawk SHD-5S, Crusader CRD-6D, Crusader CRD-6T, Atlas AS7-A

3.8
- DLC4 compatible

3.72
- Fixed missing left arm PPC on Banshee BNC-3S

3.71
- Updated Mongoose and Hornet animations

3.7
- General bug fixes

3.61
- Added Mongoose MON-66, Mongoose MON-66b, Mongoose MON-67, Mongoose MON-69, Mongoose MON-70
- Fixed Damage Mesh on Mongoose

3.5
- Added Assassin ASN-23, Thunderbolt TDR-5Sb
- Added Thug Blackwatch Skin

3.41
- Fixed skins showing up twice in Mechlab

3.4
- Added more skins to Valkyrie
- Added Hornet HNT-151, Hornet HNT-152, Hornet HNT-161, Hornet HNT-171

3.3
- Added Valkyrie VLK-QA, Valkyrie VLK-QF, Valkyrie VLK-QF

3.2
- Added Locust LCT-3D, Griffin GRF-1DS, Catapult CPLT-C4C, Orion ON1-MA

3.1
- Added Archer ARC-5CS
- Updated Mech-"Unit Cards"
- Minor Bug Fixes

3.01
- Minor bug fixes

3.0
- Compatibility with DLC 3

2.6
- Slight Atlas II overhaul to make it look more lore friendly
- Added Shadow Hawk SHD-2Ht, Marauder MAD-5CS 

2.5
- Minor bug fixes
- Changed BL-9-KNT hatchet to something more swordy
- Added Warhammer WHM-7CS

2.4
- Animated all Atlas missile launchers
- Added Black Knight BL-9-KNT, Archer ARC-5W, Archer ARC-5R, Thug THG-11Eb

2.3
- Added punching animations to Thug
- Added SuburbanMech UM-R90, SuburbanMech UM-R100, Catapult CPLT-K3, Cataphract CTF-3D

2.2
- Added Trebuchet TBT-5S, Wolverine WVR-7M, Charger CGR-1A9, Hatamoto-Hi HTM-27U, Hatamoto-Mizo HTM-27Y, Banshee BNC-3Q

2.1
- Removed variants that came with the DLC
- Added Phoenix Hawk PXH-3D, Phoenix Hawk PXH-3M, Phoenix Hawk PXH-3K, Zeus ZEU-6A, Zeus ZEU-9S2

2.02
- Fixed right missile launcher on King Crab KGC-010

2.01
- Fixed hitbox issue with Hunchback II HBK-2

2.00
- Added Cockpit hitbox to UrbanMechs
- Added Marauder II MAD-5B, Marauder II MAD-5C

1.99
- Added Jagermech JM6-DG

1.98
- Added Hunchback II HBK-2

1.97
- Fixed clipping issue with the Thug THG-10E & THG-11E

1.96
- Added Locust LCT-1Vb, Locust LCT-3M, Raven RVN-3M, Tunderbolt TDR-9S, Stalker STK-5M
- Lowered Flea FLE-14 tonnage to 15t

1.95
- Added King Crab KGC-010

1.94
- Added Flea FLE-14 (now properly jump capable with jump jet flame and without busting into pieces)
- Added Cicada CDA-3F jump jet flame
- Removed left torso missile launcher remains on Atlas II for good
(Note: Atlas II, Cicada CDA-3F and Flea FLE-14 have their own category in "Instant Action")

1.93
- Made changes to the Atlas II hardpoints (Reskinned gunpod and can be colored now, added blank to left shoulder)
- Updated SHS-Version to 1.93

1.92
- Added traits to Thug THG-10E & THG-11E
- Improved Thug paperdoll outlines for better visibility

1.91
- Fixed indestructible legs on Thug THG-10E & THG-11E

1.9
- Changed ballistic hardpoint on Atlas II
- Added "GentlePayload's" Thug THG-10E & THG-11E

1.8
- Changed all Atlas II hardpoints to fit the original version
- Moved Grand Dragon laser hardpoint from left arm to right torso
- Fixed missing color schemes on some mechs

1.72
- Added Warhammer WHM-7M
- Moved WHM-7K left torso SSRM2 to right torso
- Added alternate version which treats all engine heatsinks as single heatsinks regardless of DHS-tag

1.71
- Added missing Streak Srm 2 to WHM-7K

1.7
- Added Flea FLE-4, Flea FLE-16, UrbanMech UM-R63, Wolfhound WLF-2, Vulcan VL-5S, Vindicator VND-3L, Dervish DV-6Md, Rifleman RFL-4D,
- Marauder MAD-2R, Marauder MAD-3D, Marauder MAD-5M, Marauder.MAD-5S, Battlemaster BLR-1Gb, Battlemaster BLR-3S, Nightstar NSR-9FC,
- Atlas AS7-S, Atlas II AS7-D-H, Atlas II AS7-D-H2 from MechVariety.

1.6
- Added Vulcan VL-5M, Wolverine WVR-7D, Champion CHP-3N

1.5
- Fixed ECM Tag not showing on some mechs
- Added Cicada CDA-3F, Enforcer ENF-5D, Cataphract CTF-3L

1.4 Release
- Added Banshee BNC-5S, Stalker STK-5S, King Crab KGC-001

1.3 Release
- Fixed missing color schemes on some mechs
- Fixed a bug with Thunderbolt TDR-5Sd not showing its UC5
- Added Javelin JVN-11A, Javelin JVN-11B, Archer ARC-2K, Archer ARC-4M, Warhammer WHM-7K, Warhammer WHM-7S, Awesome AWS-9Q

1.2 Release
- Added Commando COM-5S
- Fixed a bug with Grand Dragons not showing their arm weapons
- Fixed a bug with Kintaro 19b not showing its LRM15

1.1 Release
- Changed the folder name. Please, delete the old one.
- Fixed all Blackjack missile hardpoints. (Shouldn't clip anymore)
- Added all hidden color schemes to the mechs. Mod is now fully compatible with "UnlockHiddenColorSchemes"

SWITCHED MOD MANAGER TO MW5 LOTS. Way superior.

If you use "Mech Variety" load it before my mod.
and use a Mod Manager to sort your load order.
If you use "Double Heat Sink baseCoolingRate Fix", load it before my mod. I've already applied the necessary heatsink fixes to the Mechs.


Optional:
"Mech Fixes"

Added Engine double heatsinks fix;
All Mechs that come with double engine heatsinks have their engine cooling rate doubled. I did this, because most heatsink fixes are completly outdated.
If you use mods that overwrite vanilla Mechs let them overwrite "MechFixes" at worst you lose the heatsink fix for that Mech(s). 

All Jenners:
Fixed maximum armor allocation and moves the srm4 hardpoint from the top to the lower center torso.

All Cicadas:
Fixed maximum armor allocation.

All Stalkers:
Fixed maximum armor allocation.

Atlas:
AS7-D & AS7-RS: Exchanged srm4/srm6 and lrm20 hardpoints.

Archer:
ARC-2S&ARC-2RB: Moved arm medium lasers from inner to outer arm.
ARC-2K: Moved arm large lasers from inner to outer arm.
ARC-2W: Fixed Weapon loadout and Armor allocation. Moved arm medium lasers from inner to outer arm.

Thunderbolt:
TDR-5Sd: Moved SRM2 from right shoulder to right torso. Made new UAC5 right torso hardpoint. Moved a medium laser to the left arm.

Hatamoto:
HTM-27W: Added missing blanks to fix chest holes.

All Crusaders:
Added animated missile tips to Crusader launchers.

All King Crabs:
Added punching to all King Crabs.

All Dragons:
Changed left arm lower actuator punch to hand punch.

All Crabs:
Changed lower actuator punch to hand punch.

All Riflemen:
Fixed left arm weapon gap, Fixed misaligned head.

Warhammer:
WHM-6RB: Added missing machine gun to left torso.

Longbow:
Switched heavy Mech marker with assault marker.
Added missing cockpit hitbox.

Black Knight:
BL-P-KNT: Added missing left arm punch.

Crusader:
All Crusader: Tweaked hitboxes


Obsolete:
All Highlanders:
Fixed shading 

Catapult:
CPLT-K2: Changed icon to something more fitting.

All Marauder II:
Fixed Mesh 

Mission A1M4 Defender:
Fixed Jenner JR7-D you get as a reward for the mission. (Note: If you use something like "Max Tonnage" load "mechfixes" AFTER the mod that increases the allowed drop tonnage. I have already increased the allowed tonnage for this mission to 400 tons. In case you don't use it this shouldn't be a balance issue since you don't have the Mechs or Pilots during that stage of the game to exploit it.)

Installation:
drop the folder into "....\MW5Mercs\MW5Mercs\Mods"

credits:
sarna.net (for the lore)
mordel.net (for the technical data)