Ah. The Gunstar. A personal non-trek favourite. A few things of note here:
1) In the film whilst there weren't two different gunstars, the one that was actually used was a heavily modified standard version. Grig himself stated that it could survive several direct hits (which meant that its shields/armour were far suprated compared to the normal version). It also carried the special weapon known as the "Death Blossom" which was a last resort but highly destructive weapon.
2) The film was the second to carry completely 100% computer generated graphically made items on screen (Tron was the first), although it was the first to have completely CGI space and ship settings.
3) A sequel was planned but never got past the script stage. Apparently it followed the continuation of Alex Rogans life and was supposed to be set directly after the first film. It went on to show the rebuilding of the Star League and Xur was supposed to return. Shame really as I've always found it to be an amazing film for its time.
4) The actual game Rogan plays was rumoured to have been made by Atari. Shame really because ever since I seen the film i would have loved to play the thing.
Anyway, now I've waffled in anough, the model looks great. Highly accurate from what I can see and might I suggest using
http://images.google.co.uk/images?hl=en&q=gunstar&sa=N&tab=wi as a bit of reference for texture colouring etc.etc.