Looks like a cross section of a giant industrial erm, A, sort of, tally whacker (translation to our NTSC buddys reads-'penis'), there, perhaps, with the large bottom bit, narrowly funneling upwards, leading upto the rounded bit on the end, which makes the whole sequence a hell of a lot more comical when you think of it that way!
Hang on, the death star could be the egg. The rebel transports (if you add a tail) could be the swimmers, eah, maybe....?
Ive read far too many books, methinks.....
Sorry to lower the tone :-(