As an outsider's view, I know this may be annoying, but I have a suggestion.
In total conversions, people usually get ideas to replace current items. I remember I suggested the same replacement method to the FS2 > Armada mod that bit the dust. Well now that I think about it from what they said, It makes a lot more sense to keep the same function of things in freespace then adapt them to be SC's units.
Point in case: It may be better gameplay wise, to make the GTA AWACS an observer type, but don't make cloakable to be just like the observer. I'm thinking the idea is to make FS2 into a sweet RTS using starcraft, not simply replacing SC's units with FS2's.
What i'm saying may be a little extra work in the long haul, but it would make it a lot better.
[/KT's 2 cents]