Okay, OKAY I've got one!!!
The kit of the 'Cygnus' from the 1980 Disney movie 'The Black Hole'.
I've heard the kit is pretty rare and really expensive now. But also I've heard is it sucked so I haven't looked though Ebay or anything like that for one.
But if a time machine is available I'd hop back to 1980 to see if I could pick up a copy.
It's one of the most beautiful ships in SF movies. I find it odd no one ever did a garage kit of the ship. Although to get the full effect you'd have to do most of the hull with a PE frame, clear parts, and lights inside...