As for the protoss carrier, I've got one started in 3ds. I've got the front 'prongs' looking alright (At least as well as I can from the limited footage of the thing. The in-game models are contradictory.)
But I've given up on it, if anyone else wants to try to finish it be my guest.
I've got several game snap shots from fighting and cinematics too.
Here's what I have so far. :/
Email me if you want to finish it.
I figure it would have around 20 turrets total, and a shield as well (Have to!)
Naturally it wouldn't have extra weapons in SC due to game balance.
Plus two fighterbays, one on either side for fast dispatch/withdraw of fighters.