[hleV]

Nice, but are you completely sure that you can only replace the already made weapons and not create new ones? In ESF (which is a mod and possibly uses some different weapon system) you can actually create new weapons by registering a command (like "weapon_new") to hook when the weapon is selected (or force the player to select it), writing certain messages and setting weapon's new ID (if the last ID for ESF is like 34, then for the new weapon it would be 35) in certain messages and of course setting up the weapon_new.txt file.