This changes the crafting system by removing the ability to just craft after learning the perk. It now requires you to read the schematic and have a point in the perk to be able to craft items.
There is a work around if you want to test out certain weapons, If you acquire enough schematics of a given item you will be able to craft a level 1 and try the weapon out. The leveling of weapons still goes off of the perks, so if you want to craft higher tier gear you need to spend the points.
The forum topic of the mod is here.