Thanks again for your thoughts, I can imagine that the film would be a little slow for anyone who hasn't seen the series. I think Joss Whedon needed to make a film to tie up the loose ends that were created when the network canned the series, most of them were dealt with but it seemed that a couple of them were skirted round which is a bit annoying.
NextDesign, those are the very shots I'm using for reference, I have some schematic outlines too. Cheers for the thought though.
I agree Jay, not much beats The Empire Strikes Back for me either, one of the few times that a sequel outshines the original, is it fair to calll it a sequel though as they were written as one complete story and it was episode 5 anyway!?!
Here's an update, I've done the underside of the wing and made a start on the back/abdomen bit.