All right, serious critique time from a modeler's perspective.
First of all, Steele's model isn't really a very good starting point ... it was designed years ago for X-Wing Alliance, and the model has some issues in a number of areas, notably the rear and, as has been noted, the position of the conning tower. Playing around with existing models can be fun and instructive, but in the end you'll usually find that if you have to make major changes, that remaking the design from scratch is a better bargain.
The textures, frankly, need work. The centerline 'exposed superstructure' bit is all right, but the hull looks pretty messy, an almost fabric-like texture. In my opinion, you'd do well to go for a cleaner look in the final version.
Windows, I think, should be smaller and sparser, and look better - more of a qualitive than quantitive approach. As of now they look fairly similar to the WCIII model - however, and I may be in the minority here, but I believe that, as it's been eleven years since Heart of the Tiger, there should be a graphical improvement in that department as well. The same goes for the model - it could benefit a great deal from more aggresive use of polys and a smoother overall look. I'm not saying you should turn the Victory or Relentless or whatever into a space-rocket - but even boxy designs like a carrier can benefit from such, and the difference is quite noticable.