Hello!
While I can’t help you with the Trumpeter kit, I’m building my own Whale now, although in 1/72:
cs.finescale.com/…/1811787.aspx
So it sure helps to research the real thing. One of the nicest web pages there are on the Whale is this one:
tailspintopics.blogspot.de/…/douglas-a3d-skywarrior-main-landing.html
Hope it helps, good luck with your build and post some pictures! Have a nice day!
Paweł