Looks great so far. And by the way, I remember reading earlier that blizzard said map changing WILL work for all players. I don't know if it currently does, but they said that it will.
Also, how exactly are we going to do the gameplay? top-down? 3rd person shooter? Change it depending on the map?
I've also been thinking of various map / story ideas.
This is just brainstorming, and most of it was accurately captured by your image. But we could have the "main" map be an alpha site, rather than the stargate command from the show. This would just give more room to fit in things like upgrades/research without having to copy that area exactly and have limitations. It also allows room for things like exploration, as it's a different spot in the galaxy.
I've started work a bit on a map. Assuming we choose to do this, it could even serve as a first mission/tutorial. Right now, there's a crashed ship which is the starting area. I could even make an intro cinematic of the ship being attacked and crashing. You have to find a stargate to find a way home. Once you get to it, you start being attacked, and must defend the gate while another member of the ships crew is attempting to figure out the correct order of numbers to get home. The crew member will say things like "Chevron 1 is 3! 2 is 6!" and so on while you defend. I think this would be a cool mechanic that shows off dialing, while also letting the person feel smart if they crack the code before the last numbers are given.
Just random thoughts. Let me know what you think