Ok, just to see if there is any mileage in this, here is the original Puma lightwave model used to render the sprites used in the game:
You need to unzip it first, then open it in lightwave modeller, like so:
The model is in lightwave format (http://www.newtek.com/lightwave/) which isn’t cheap, but you can get a free trial of it. You can also export it to other formats, although AFAIK the textures screw up badly when you try that. I am NOT the modeller who made this, and I am not very familiar with lightwave, so it’s no good asking me how to do stuff :D.
Don’t go passing this file off as your own work, because it’s not. It’s an original spaceship design by Charles Oines, for the game Gratuitous Space Battles, and you may not use it in any commercial product or freeware game. It’s being released here purely to help out the modding community for GSB. The copyright with that file is still very much with Positech Games. Play nice
My thinking is that anyone who is good at 3D modelling might be able to to add a few extra bits, or rearrange a few bits, and change some textures and render out a new puma variant ship for the game. Maybe. I dunno