BLACKSMITH

Build a smithy workbench with one level of Blacksmith skill, then make your own swords and pipe guns out of readily available scrap. You will be able to build all standard pipe guns, and with Science skill you'll be able to build laser muskets.

"Blacksmith" adds five new swords to the game, and adds recipes to build the revolutionary sword and Chinese officer's sword. All can be modded. The mods for the new swords -- epee, smallsword, saber, court sword, and rapier -- do not change the weapon but represent the player's training and experience with a particular sword. You'll need stimpaks and buffout.

You will be able to craft simple metal armor. There's also a blacksmith's hammer.

"Blacksmith" is intentionally a very simple mod. It will make things for which all you need is a hammer, an anvil, and a clamp to hold things steady. More modern equipment only works if it's build to precise tolerances, which requires an industrial infrastructure. If you want to make advanced gear, you might start with the Contraptions Workshop DLC which will let you build weapon forges. You might also try Vazeron1's "Craftable Guns and Weapons" https://www.nexusmods.com/fallout4/mods/1224

RECOMMENDED MODS:

osnius: Bodyslide and Outfit Studio
https://www.nexusmods.com/fallout4/mods/25
Convert Blender .obj files to Fallout 4 .nif files.
I used it to convert swords from Oblivion and Skyrim nif versions, and to adapt the smithy.

DegenerateDak: Handmade Rocket Rifle
https://www.nexusmods.com/fallout4/mods/69209
A very nice addition to the pipe gun range.

PERMISSIONS:
I release my own assets in this mod as a modder's resource, under the usual provisions. (They are based on FO4 resources; don't sell them or transfer them to another game.) The saber, court sword, and rapier are based on models for which permission has been granted: see "Credits" below for details on use.

CREDITS:
The rapier model and textures are adapted from lewisdude's "Emerald Rapier" (http://www.nexusmods.com/skyrim/mods/17228) which uses mystikhybrid's "Goldbrand Rapier" (http://www.nexusmods.com/oblivion/mods/7909)
All are used by permission.
The court sword is adapted from throttlekitty's Oblivion rapier set (http://www.nexusmods.com/oblivion/mods/18846). This was released under a Creative Commons license, and I use it under the same license: "You are free to copy and re-distribute the work, as well as make remixes/alterations. (and distribute those as well!) This is provided with the following conditions: Attribution must be given to the original author. Noncommercial: You may not use this work for commercial purposes. Share Alike: If you alter this work, you may distribute that result only with the same or similar license to this one."
The saber is based on th1098's excellent "Blucher Saber" mod (https://www.nexusmods.com/fallout4/mods/29635) and is used by the author's permission.