While I'm flattered by the offer, I'd be pretty leery about sending my figures to anyone to use in a stop motion project, because I might not get them back, or get them back in poor condition. So, as I don't know you from Adam, I'll have to decline. If you lived locally, maybe we could work something out, but the likelihood of you being in easy traveling distance to me is probably slim to none.
Only three of my Quake 1 figures (the Shambler, Rotfish, and Gremlin) are even articulated, and they're ridiculously out of scale with one another, so I don't think a stop motion production would work very well with them anyway. Both of my Quake II figures are articulated (although fairly limited), and they are relatively in scale with one another, but, again, I'm not comfortable with loaning them out to anyone that I don't know well and in person.
As a possible alternative, I'd suggest tracking down a set of the Quake II 6-7" action figures that Resaurus made in the 90s--they're all articulated and you'd have a relatively diverse selection of characters to use (male marine, female marine, tank, iron maiden, barracuda, parasite, and technician). I bought my set, loose, but complete, for around $20-30, including shipping, off of eBay years ago, so they're relatively inexpensive to obtain.