Since this may not be needed for Lightning Marshal, I've been allowed to release it to you guys.
The GTT Naxos exists as a replacement to the Argo transport, which was decided to be inadequate for the changing needs of the GTVA. The Naxos boasts a 33% speed increase over the Argo, and numerous enhancements designed to minimise the downtime so common with the Argo class. These enhancements include redundancy in engine control, and a new style of automated turrets that have self-contained power systems and exist fully outside the hull. This means that crew requirements are lower, leaving more internal cargo storage space, and that the turrets are able to be replaced in mere minutes in any drydock.
Image (140KB, 982x655 pixels, lvlshotted):

It's a fully completed model as of a rather long time ago, so here's a zip with everything you need, including a test mission. If you want to use the Naxos in any of your own missions/campaigns, then that's fine too - I'd like it if you dropped me a bell via PM sometime though so I know where it's going
http://www.swooh.com/peon/Odyssey/models/gttnaxos/gtt-naxos.zip~ Mesh, minor texturing, and POFing by me
~ Hull and LOD texturing by Stunaep
Enjoy!