This is a really exciting design concept! I've been dreaming up similar concepts with a tugboat theme and run into the same challenges as you have.
Duane King wrote:... My design as it stands would be rather heavy (depending on materials and construction techniques used) and would never live in the garage. The curved roof is fun, but the raised cupola portion would push a lot of wind. I made major porch overhangs because that is a design element you expect to see in a caboose. But also, this is not anything approaching aerodynamic efficiency.
At this point I would probably not want a lift up roof. If I was to build a caboose, it would need to look like a caboose while it was on the road. A fold down or crank down cupola roof would make that impossible. So I've never really considered an adjustable roof. . .
As far as trying to maintain some kind of aerodynamic efficiency, that is a compromise with a design like this. Vents in the curved roof of the front overhang could help reduce trapped air. A removable plexiglass wedge placed on the roof in front of the raised cabin could streamline, maintain the "look" while traveling, and be knocked-down & stowed while parked.
Looking forward to see how this project develops... keep it going!!!