'Sup, haven't been on in a few days.
All you're looking for right now is replacing weapons & ammo for the shops? If you can PM me a link to the project, I'll get started; any actor involved in USDF scripts needs to have a ConversationID property set to it, so that the scripts can add, take & check for the items appropriately.
Just so you know, replacing the Sigil is a *lot* more involved than you might think, as I found out the hard way with my Strife project. Among other things, you'll need a modified strfhelp lump, which contains an ACS script used on the alien ship map to open the boss door only if you have all 5 Sigil pieces.