It adds a new "Weapon Mod Kit- Prototype kit" to the bench crafting system. it's a resrouce - havent added it to the leveled lists or merchants yet. it works at the bench if you want to craft a weapon using the new kit in to the result weapon.
so if you want to add a kit
or a new weapon.
it makes it obvious how to do it. all the references are right here in the MOD so you can see what changes were made using FO3edit.
the mod contains a weapon example and a new kit example.
here's the link to the f3 nexus:
WMK + FWE master. esp (the FOIP compatability patch..)