This mod replaces the Farmer structures of his build ability with several game assets.  I originally used around 300 assets but iterating so many is a pain, so I reduced the list to 137. Some assets are empty from the back, mostly those from the Throme Room. 

Installation

Extract the zip file. The content is a pak file that must be copied to the game Paks folder (e.g:  C:\Program Files (x86)\Steam\steamapps\common\Goat Simulator 3\Goat2\Content\Paks)

Credits
Dmgvol/UE_Modding: Collection of UE4/5 Modding Guides
FModel
atenfyr/UAssetGUI: A tool designed for low-level examination and modification of Unreal Engine game assets by hand.

Discord
Please join the Goat Simulator 3 Modding Community. 

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The actual game assets included in this mod are these, kind-of grouped by purpose:

# Floors
Goat2/Content/Structures/Mountain/Mesh/SM_WoodenWalkway_2X_02
Goat2/Content/Props/General/Meshes/SM_ConcreteSlabCube_1x4
Goat2/Content/Props/General/Meshes/SM_ConcreteSlabCube_2x2
Goat2/Content/Props/Park/Meshes/SM_ChessBace
Goat2/Content/Props/General/Meshes/SM_WalkwayStones_01
Goat2/Content/Structures/Bridge/Meshes/SM_Pier_Boulevard
Goat2/Content/Structures/Buildings/Meshes/CondoBuilding/SM_CondoTop
# Walls
Goat2/Content/Props/General/Meshes/SM_BrickWal_2x_2z
Goat2/Content/Props/General/Meshes/SM_BrickWallPillar
Goat2/Content/Props/General/Meshes/SM_GenericWall_2x
Goat2/Content/Props/General/Meshes/SM_WallConcrete
Goat2/Content/Structures/Buildings/Meshes/Skyscrapers/Museum/SM_Museum_Wall_01
Goat2/Content/Props/Fences/Meshes/SM_StoneWall
Goat2/Content/Structures/Farm/Meshes/SM_BarnDoor_01
Goat2/Content/Props/Fences/Meshes/SM_Slipers_01
# Tree planters
Goat2/Content/Props/General/Meshes/SM_TreeGrille_01
Goat2/Content/Props/Planters/Meshes/SM_TreePlanterConcreteCircle_05
Goat2/Content/Props/Planters/Meshes/SM_TreePlanterConcreteSquare_02
Goat2/Content/Props/Planters/Meshes/SM_TreePlanterWood
# Trees
Goat2/Content/Environment/Foliage/Trees/Meshes/Juniper/SM_Juniper_Tree_02
Goat2/Content/Environment/Foliage/Trees/Meshes/NatureLandscapeAssets/SM_Conifer_02
Goat2/Content/Environment/Foliage/Trees/Meshes/NatureLandscapeAssets/SM_Conifer_01
Goat2/Content/Environment/Foliage/Trees/Meshes/NatureLandscapeAssets/SM_Palm_01
Goat2/Content/Environment/Foliage/Trees/Meshes/NatureLandscapeAssets/SM_Pinetree_01
Goat2/Content/Environment/Foliage/Trees/Meshes/NatureLandscapeAssets/SM_Tree_01
Goat2/Content/Environment/Foliage/Trees/Meshes/NatureLandscapeAssets/SM_Tree_01_02
Goat2/Content/Environment/Foliage/Trees/Meshes/NatureLandscapeAssets/SM_Tree_02
Goat2/Content/Environment/Foliage/Trees/Meshes/NatureLandscapeAssets/SM_Tree_02B
Goat2/Content/Environment/Foliage/Trees/Meshes/NatureLandscapeAssets/SM_Tree_03
Goat2/Content/Environment/Foliage/Trees/Meshes/NatureLandscapeAssets/SM_Tree_04
Goat2/Content/Environment/Foliage/Trees/Meshes/NatureLandscapeAssets/SM_Tree_09
Goat2/Content/Environment/Foliage/Trees/Meshes/Redwood/SM_RedWood
Goat2/Content/Environment/Foliage/Trees/Meshes/RemadeAssets/SM_TreeSimple_03
Goat2/Content/Environment/Foliage/Trees/Meshes/RemadeAssets/SM_TreeSimple_01
# Misc
Goat2/Content/Props/Park/Meshes/SM_StreetLightLamp_02
Goat2/Content/Structures/Buildings/Meshes/Church/SM_MausoleumDoor
Goat2/Content/Structures/Signs/Meshes/SM_MornWoodSignBase
Goat2/Content/Structures/Farm/Meshes/SM_TrellisCarport_02
Goat2/Content/Structures/Farm/Meshes/SM_WallTrellis_02
Goat2/Content/Props/Garden/Meshes/SM_ZenGuardenLantern
Goat2/Content/Structures/Buildings/Meshes/Skyscrapers/Skyscraper_Addons/SM_Balcony_02
Goat2/Content/Structures/Farm/Meshes/SM_BridgeSmall
Goat2/Content/Props/Warehouse/Meshes/SM_RampLong_02
# Boxes
Goat2/Content/Props/Events/Meshes/SM_CageCube
Goat2/Content/Structures/Mountain/Mesh/SM_MountainElevator
Goat2/Content/Structures/Mountain/Mesh/SM_Windshelter
# Furniture
Goat2/Content/Props/Furniture/Meshes/SM_Bed_01
Goat2/Content/Props/Beach/Meshes/SM_DoubleSunBed
Goat2/Content/Props/Furniture/Meshes/SM_Bunkbed
Goat2/Content/Props/Furniture/Meshes/SM_CoffeeTable
Goat2/Content/Props/Furniture/Meshes/SM_BedsideTable
Goat2/Content/Props/Furniture/Meshes/SM_DiningTable
Goat2/Content/Props/Furniture/Meshes/SM_Armchair
Goat2/Content/Props/Furniture/Meshes/SM_DiningChair
Goat2/Content/Props/Park/Meshes/SM_PateoChair_01
Goat2/Content/Props/Furniture/Meshes/SM_BigStuffedToy
Goat2/Content/Props/Furniture/Meshes/SM_BooksSetB
Goat2/Content/Props/ThroneRoom/Meshes/SM_Bookshelf_02
Goat2/Content/Props/Furniture/Meshes/SM_BathroomSink
Goat2/Content/Props/Furniture/Meshes/SM_Refrigerator
Goat2/Content/Structures/ThroneRoom/Meshes/SM_ThroneRoomCarpet_Round
Goat2/Content/Structures/ThroneRoom/Meshes/SM_ThroneRoomCarpet_Solo
Goat2/Content/Props/Furniture/Meshes/SM_Cabinet
Goat2/Content/Props/Furniture/Meshes/SM_Candle_02
Goat2/Content/Props/Cemetary/Meshes/SM_Candelabra
Goat2/Content/Props/Furniture/Meshes/SM_Desk
Goat2/Content/Props/Furniture/Meshes/SM_LaptopOpen
Goat2/Content/Props/Furniture/Meshes/SM_LampTable
Goat2/Content/Props/Furniture/Meshes/SM_LampFloor
Goat2/Content/Props/Furniture/Meshes/SM_PoufBig
Goat2/Content/Props/Events/Meshes/SM_Christmas_Tree
Goat2/Content/Props/Furniture/Meshes/SM_SofaBig
Goat2/Content/Props/Furniture/Meshes/SM_SofaSmall
Goat2/Content/Props/Camping/Meshes/SM_WoodBench_01a
Goat2/Content/Props/Furniture/Meshes/SM_Toilet
Goat2/Content/Props/Furniture/Meshes/SM_Television_02
Goat2/Content/Props/Furniture/Meshes/SM_TV
Goat2/Content/Props/Furniture/Meshes/SM_DoorMat
Goat2/Content/Props/Furniture/Meshes/SM_Fireplace
Goat2/Content/Props/Suburb/Meshes/SM_Doghouse_01
Goat2/Content/Props/Garden/Meshes/SM_Slide_01
# Fences
Goat2/Content/Props/Fences/Meshes/SM_OldFence_01
Goat2/Content/Props/Fences/Meshes/SM_PaintedFence_01
Goat2/Content/Props/Fences/Meshes/SM_ConcreteFence
Goat2/Content/Props/Fences/Meshes/SM_ConcreteFencePost
Goat2/Content/Props/Cemetary/Meshes/SM_MausoleumFacade_02
Goat2/Content/Props/Cemetary/Meshes/SM_MausoleumArch
Goat2/Content/Structures/ThroneRoom/Meshes/SM_ThroneRoom_Balcony_Rail
Goat2/Content/Structures/ThroneRoom/Meshes/SM_ThroneRoom_Trim_03
# Plants
Goat2/Content/Environment/Foliage/Bushes/Meshes/SM_Bush_05B
Goat2/Content/Environment/Foliage/Bushes/Meshes/SM_Bush_05
Goat2/Content/Environment/Foliage/Bushes/Meshes/SM_BushFlowers_03
Goat2/Content/Environment/Foliage/Bushes/Meshes/SM_BushFlowers_05
Goat2/Content/Environment/Foliage/Bushes/Meshes/SM_Fern_02
Goat2/Content/Environment/Foliage/Flowers/Meshes/SM_FlowerConstellation_01
Goat2/Content/Environment/Foliage/Flowers/Meshes/SM_FlowerConstellation_04
Goat2/Content/Environment/Foliage/Flowers/Meshes/SM_FlowerPatchBig_01
Goat2/Content/Environment/Foliage/Flowers/Meshes/SM_FlowerPatch_05
Goat2/Content/Environment/Foliage/Plants/Meshes/SM_Plant_01
Goat2/Content/Environment/Foliage/Plants/Meshes/SM_Vine
Goat2/Content/Environment/Foliage/Grass/Meshes/SM_Grass_01
Goat2/Content/Environment/Foliage/Grass/Meshes/SM_Grass_Cut_01
Goat2/Content/Environment/Foliage/Grass/Meshes/SM_GrassColored_01
Goat2/Content/Environment/Foliage/Grass/Meshes/SM_GrassLong_01
# Throne Room
Goat2/Content/Structures/ThroneRoom/Meshes/SM_ThroneRoom_Arch_Single
Goat2/Content/Structures/ThroneRoom/Meshes/SM_ThroneRoomThrone
Goat2/Content/Structures/ThroneRoom/Meshes/SM_ThroneRoomDoorFrame
Goat2/Content/Structures/ThroneRoom/Meshes/SM_ThroneRoomDoor
Goat2/Content/Structures/ThroneRoom/Meshes/Interior_Modular/SM_ThroneRoom_Interior_Wall_Modular_01
Goat2/Content/Structures/ThroneRoom/Meshes/Interior_Modular/SM_ThroneRoom_Interior_Wall_Modular_04
Goat2/Content/Structures/ThroneRoom/Meshes/SM_ThroneRoom_CustomPart_02
Goat2/Content/Structures/BossFight/Meshes/SM_BossGate_SeeThrough
# Statues
Goat2/Content/Structures/ThroneRoom/Meshes/SM_ThroneRoom_FountainStatue
Goat2/Content/Structures/ThroneRoom/Meshes/SM_ThroneRoom_Karmameter_Base
Goat2/Content/Structures/ThroneRoom/Meshes/SM_Portal_Room_Crystal
Goat2/Content/Props/Events/Meshes/SM_Sandcastle_Mermaid
Goat2/Content/Props/ThroneRoom/Meshes/SM_GoatStatue_HeadButs
Goat2/Content/Props/ThroneRoom/Meshes/SM_GoatStatue_Proud
Goat2/Content/Props/ThroneRoom/Meshes/SM_GoatStatue_Sitting_01
Goat2/Content/Props/ThroneRoom/Meshes/SM_ThroneRoomStatue_03
Goat2/Content/Props/ThroneRoom/Meshes/SM_ThroneRoomStatue_05
Goat2/Content/Props/ThroneRoom/Meshes/SM_ThroneRoomStatue_06
Goat2/Content/Props/ThroneRoom/Meshes/SM_ThroneRoomStatue_07
Goat2/Content/Props/ThroneRoom/Meshes/SM_ThroneRoomStatue_08
Goat2/Content/Props/ThroneRoom/Meshes/SuitOfArmor/SM_SuitOfArmor
Goat2/Content/Structures/Buildings/Meshes/Skyscrapers/Skyscraper_Addons/SM_PillarDeco_01
Goat2/Content/Props/Events/Meshes/SM_ElectionStatue_01
# Rocks
Goat2/Content/Environment/Rocks/Meshes/SM_Cliff_01
Goat2/Content/Environment/Rocks/Meshes/SM_Rock_01
Goat2/Content/Environment/Rocks/Meshes/SM_Rock_02
Goat2/Content/Environment/Rocks/Meshes/SM_Rock_03
# Pillars
Goat2/Content/Structures/ThroneRoom/Meshes/SM_ThroneRoom_Pillar_01
Goat2/Content/Structures/ThroneRoom/Meshes/SM_ThroneRoom_Pillar_03
Goat2/Content/Structures/ThroneRoom/Meshes/SM_ThroneRoom_Pillar_05
Goat2/Content/Structures/ThroneRoom/Meshes/SM_ThroneRoom_Pillar_06
# Big stuff
Goat2/Content/Structures/Buildings/Meshes/Church/SM_Mausoleum
Goat2/Content/Structures/Buildings/Meshes/LightHouse/SM_Lighthouse_Old