Headwax: Thanks for the links, certainly some nice work in there. Agreed re the mesh thing, I had no idea for ages that pre-made meshes were available... in fact it still feels kinda wrong somehow. I suppose in the mainstream 3D animation industry the modelling, rigging and keyframing are all done by separate teams, so I guess there is nothing wrong with the e-doll concept, so long as credit is given where due. Like you I am kinda proud to have come to this hobby via Anim8or, where pretty much everything is 'do it yourself'. In fact, I don't even use modelling scripts!
Indian8or: Cheers mate. Funnily enough, the engine's motion (along with almost everything else) was defined by Carrara's physics engine, so in some respects the spinning is actually correct! In reality it is caused by an oblique collision with the terminal building in the background, it just appears to be caused by the jetting exhaust gas. If this was to be a 'finished' project I would probably have rehashed the motion for the engine, since it is at least questionable and detracts from the overall effect a bit, but I liked the way the spray came off it and since this was a particle generator test I left it in, more for giggles than any other reason. I suppose it could be argued that the engines might be slush-hydrogen powered scramjets, and there would be sufficient rapidly-vaporising hydrogen in the pipes or flow regulators or whatever to ignite and blast out the back for a while, particularly if the feed pipe was bent or blocked in the crash and through the engine was the only way for the gas to escape. I dunno, whatever!
Lynn22: Thanks for the encouragement and links, I have made a note of them. I generally use Magix Movie Edit Pro for compositing, which apparently has chroma-key functionality, I just need to figure out how it works. If it is weak or difficult or just plain dumb I will certainly explore Wax and CineGobs Keyer, both of which look excellent.