This is a simple addon that alters mostly only upgrade kits recipes.If you found some recipes are overwhelming, you can give this addon a try - it overly-simplifies the crafting recipes so you can actually start upgrading your weapons and suits only with simple misc. items - all you need are metal scraps, fasteners, hammers, and duct tapes, which are all very accessible.
Below are the examples of typical crafting recipe for any upgrade kits - they all require the same amount and types of materials.
Now, I would not claim that this addon is balanced or realistic, and it is far from perfection. This is just one attempt to make crafting in general more approachable than how it is in vanilla :)
Also, big thanks to arti for inspiration, I'm sure he will come up with a better and streamlined solution to amend the current inapproachable crafting system.