Actually, the nacelles are pretty much the same as before, just with different (but simple) hoods and fins. I'm pretty confident in both of those. The two areas I really want to see someone else do are the impulse deck and the secondary hull. Just a suggestion for when you build it too: try making one thick reinforcing strip for the pylons. Cut slits in the hull and slide it in. It works better as one single piece, not one for each pylon. Then just wrap the pylons around it and glue in place. I find it also helps to make it long enough to fit in the nacelles, which I also cut slits in.