I'm always for more crafting recipes, that seems way too cheap. If I were you I'd think about saluaging parts from more weapons to make the mods and including things like chemical baths and tools, maybe weapon repair kits, etc. Not TOO complicated, but you shouldn't be able to loot one garage and come out with ten mods either.
Well, I don't exactly want to add a bunch of proprietary items, especially when they may sort-of-conflict with other mods, where you have two different recipes to break a weapon down into two different versions of the same parts. This is also only the 10mm pistol, a pretty low level gun, as far as I know. And I'm planning on having the schematics themselves either be fairly expensive, somewhere around 10 times to combined values of the kits it let's you make probably, or in areas you need pretty high skills to get to. The 10mm kits already require a repair skill of 75 to make, and it's probably just going to get higher for other weapons