Yeah I see what you are getting at, my theory behind it would be this: the front is the engine housing so you'd want it to have accessible paneling to lift off for repair etc. Also Im thinking of the whole structure like that of those racing speed boats, very light yet fast. With some smooth angles and some not so.

The rear of this vehicle behind the seat is a fin with a ribbed rubberised cover to hide any innards.

I also wanted to put a big throbbing piece of machinery between my girl characters legs....

Cheers
Jay