We will still not add new weapons to the game. But we want to give every weapon a own 3d model.
Both zip gun and pipe rifle are 'traditional' Fallout weapons. According to this:
http://www.fo2238.fodev.net/wiki/3d_graphics_development_tracker pipe rifle even has a skinned 3d model already. So why not introduce those ones as first, simplest, crappy, craftable weapons? Sth for a 1-4lvl player to start with.
When it comes to ammo - as I've said there could be some kind of simple quest to get those. I thought of a little modification of a 'brahmins&shovel' quest (just an additional dialogue branch with one simple script)
<Player, after cleaning the pen talks to herdsmen>
P: OK, it's done. Say, maybe you have some spare zipgun rounds? I'm kinda running low on ammo lately...
H: Er, 9mm bullets? Yer fancy shootin' rats or what? <chuckles> Damn, whatever. You can have these if you want. No one sane uses this crap anyway.
P: [in<6] Thanks, see you around
P: [in>5] It sounds quite intriguing when a person of your occupation call things 'crap'. See you around.
(Player gets amount of 9mm bullets equal to the number of 'craps' he shoveled.)