This is a tough ship. More so than the League base. The geometry isn't particularly interesting. It looks like a pencil with various bits and pieces stuck on it as an afterthough. Which is probably the idea. This means the textures need to work really hard to make this ship look nice. Good luck with this one.
Okay, a few little things. I'd appreciate some thoughts from other members of TBP team if they're around on this because I may be way off here.
The textures on this model are too regular and too generic. The different parts of the ship need different bits of individual detail on them make them stand apart.
The main hull "tin can" texture needs to vary a little along the length of the ship. Check out the AOG model pictures. The fuel tank things need fuel tank details. The ... erm... barrels, need barrel details. In both cases I'm talking subtle details. Rather than slapping on a rusty barrel texture

. The beam cannon nose is a pain. There are supposed to be 3 rings and a load of mechanics underneath. Check out the IFH and Jump Point reference pics. I notice the beam cannon nose has a glow on it. You don't need to worry about that. FS2 does a great job of muzzle glows when beams fire. Best just leave a black hole with a nice gun muzzle detail around it.
Colour wise I think the grey panels are too dark, and I think classic Narn red would probably work better than the brown. Thunder's comment about the ship needing to look more weathered is a good one, although I wouldn't know how to do that. Is there anyone who does?