If you guys decide on making a mod, try sgnonline.com and the moderators there are happy to host a place for you for free, they did some work on mods for Startrek Armada in the past so if you want a place to discuss ideas and work, try there.
I would very much like to see an SG mod. You could cover the major races from Stargate so could have:
Earth - F-302, Gateship/Puddlejumper, X-303 Prometheus class vessels, BC-304 Daedalus class vessels, DSC-305 Odyssey upgraded vessels, Aurora class ships
Asgard - Daniel Jackson class, Belikisner class, O'Niell class
Wraith - Dart, Scout Ship, Transport, Carrier, Cruiser, Hiveship
Asurans - Gateship, Asuran warship, Aurora class vessels, Cityship
Goa'uld - Deathglider, Needle Glider, Tel'tac, Al'kesh, Osiris ship, Ha'tak, Apophis Supermothership, Anubis Supermothership
Ori - Ori fighter, variant of a Ha'tak which would be used by Illac Renin, Ori Warship
The reason I didnt add Replicators is because I think they are too powerful and perhaps using the Pegasus Replicators might be easier to do. Pirates could be the Lucian Alliance. The Ori I suggest making new designs based on Goa'uld ones and say they are used by the Ori followers while their Mothership will be very expensive but very powerful.
I know not a lot of designs really so quite a few stuff would have to be made up. I wish you the best of luck and will keep watch on this project.