Completed! It still looks like it's made of cardboard, but on the whole I'm pleased with how it turned out. Not every detail is there, but I admit that cardboard as a medium appeals to me because the build can go so quickly...and time can be of the essence (especially when I work when I should be asleep)
The cockpit comfortably fits two 6" figures side by side, and I plan to print out some dials and buttons to liven up the interior. It makes quite an imposing presence sitting between life sized Yoda and Unicron.
Like I said, there is a roughness to these cardboard builds that I could possibly overcome with some extra effort...but I enjoy them and love the extremely low cost of materials...I can scratch the creative itch with very little financial outlay.