So this is just a mockup? I assume you're planning a subsequent build with different materials then?
Indeed. the ultimate goal of this project is to build a styrene model with a mount and light up effects. So will have plastic, balsa wood, copper, steel, fiber optics, styrene, acrylic... probably some other materials in there. Right now this stage of the projects is for figuring out how to build the physical model. Looking at the mock up at this stage, one thing that's bugging me is how 'flat' it is, which ironically does match up to the in-game version. But yeah...
If you look at the Raptor and compare it tot he Excalibur, the Raptor is way more interesting to look at. It's got all sorts of panel lining and surface details that give it life. While the Excalibur... um... yeah. It's just kind of there. It gives me good references for size and dimension... but it looks more like a toy then a space fighter. This does appear to be a game engine limitation. If you look at this artist rendering of the Long Bow, you can see the same panel work and surface details reminiscent of the Raptor image.
This rendering of the Excalibur shows that other artists have come to the same conclusion:
So once I have a good idea of how to build the over all shape of the Excalibur, I'll be working on adding the surface details. And when I complete that, I'll go back and figure out how to achieve the lighting effects I mentioned.