Okay, I found this a few days ago...
http://spring.unknown-files.net/?page=browse&dlid=2066
It's a mod for some game system called Spring, which is a free RTS total annihilation type thing...
http://taspring.clan-sy.com/
it can be got here.
To my knowledge, this is the first RTS for Gundam out there. It's a li'l shaky, because it's still in the test stages (Feddies, you can win REAL easy by mass-producing the Type 61 tank and tank-rushing the Zeeks!)
It supports AI, and you can also play against other people.
Not bad for a freebie.
