I think the greatest problem would be, that you would need some kind of scematic, as this is what you need for every other craftable stuff.
And now think of how or when you should be able to get these scematics.
- By loot? From any kind and type of machine or just by rivals? Limited to a specific player-level like the experimentals (from level 25 on)?
- By world, like the normal (1c to 5c) scematics for clothes and ammo?
- As reward for homebase-defenses like the experimental ammo?
These solutions or possibilities would make it necessary to spent much time to get all scematics you need, to travel all around the map, to be far in story progress or in your characters level… Or in other words: too late to be really useful, as you probably would have found almost every weapon since then.
One possible and new way to get these scematics could be a new skill-tree (the mechanic) and a rised level capacity.
Imagine to spent your skillpoints on crafting-skills to be able to create things you would find ways later in the game… Or even things that noone else of your party can craft… With the negative side-effect that you wouldn’t have spent them on other important skills in early game.
I personally love this idea.