Problems

After a small amount of shuffling around, I had the LED's where I wanted them (not so close to the engines that they appeared as bright points, but not so far that you couldn't see them).

However, the taped together pieces did reveal another problem. Some of the bits didn't fit. I'm not sure why, it may have been the cutting of the paper template, inaccuracies from snapping the clear sheet, or something else. Not sure. Either way - there were some quite nasty gaps.

I considered trying to fill them with thin strips, but rejected this as a bit of a bodge, and very likely to cause more problems then it would solve. So, biting the bullet - I scrapped several pieces, and re-did them. This time I used the thinner plastic, so cutting was a much quicker and simpler process.

I never mentioned before, but as you can see in the image I've also been following another of Ian's suggestions and etching details into the various panels. I've been using a small tool I use for clay sculpting for this, seems to work well enough so far.

Finally, all the bit fit! - Or at least fit well enough for my first amateurish attempts at this.