^ Going by the in-progress pics, I'd say the upper parts are mostly parts of the V-22's engine nacelles (
CLICK), while the shroud the nozzles attach to are Beaufighter cowlings (
CLICK).
Also, check out the other builds of the contest this one participated in. Pics in
THIS GALLERY. A little awkward to navigate with the tiny preview/teaser pics, but very well worth the clicks. I'm kinda partial to
THE MUDSHARK. Wow!