Where there's Gratha, there might also be Fralthi close behind. Michelle has followed up on her 500 polygon fighter model with a 500 poly capship. The main spaceframe is one solid mesh with engines and glass elements merged separately. Both light carrier and cruiser variants were modeled, and a neat cutaway perspective even provides a look at a possible interior.
Here's another look at the missing Centurion, this time from the original model sheet sketches. The Centurion model was actually completely rendered and textured - we saw the finished version when we visited Gaia! Only one variant was created, though, which gives you an idea of what point they were removed from the game.
This is part of a series of beautiful Wing Commander Arena concept images graciously provided by Gaia Industries. You can find the original article here. You can thank the guys at Gaia by picking up Street Trace NYC on Xbox Live Arcade!