Welcome Silk and Vostroya,
Yes, If you wish Vostroya, you can place a Zeon pilot. They would be limited to Zaku IIs, Goufs, at the outset with Doms coming in fairly quickly. The Suits for the twin Zeon Aces will by Custom Zaku IIs as Acar's Gouf would be a custom model as well.
Silk, If you wish you are welcome to play the One, or both female aces. The Main reason for their defection was to prevent the assassination of a Young girl. Her father was a high ranking Figure in the Zeon Government. His political views were not very popular.
It's not Gundam without one of those pilots... no wait it's not Gundam without an ace pilot who has no piloting skills whatsoever, is some sort of computer wiz, and a staunch pacifist. Yeah, that sounds about right.
As I mentioned before. While this does take place in the UC universe. It is patterned after the MS: Gundam: 08th MS team Series. Which didn't utilize the "Newtype" Plot device.
If you want Silk, Vostroya. Go ahead and put your character sheets up in the OCC/Character Page I have set up. :)