A few years back a multihull sailor friend wanted to face the recession proactively by building teardrop trailers.  Its really a pretty good idea to use boatbuilding technology to do that.  I designed one using a sandwich of 3mm plywood faces with 3/4″ pvc core.  Biaxial corners and glass cloth on the exterior and wear surfaces.  I recall he built it bright.  It is light, strong, quiet and insulated.  He had a budget of one hour design time, so the 3D model is pretty spare.  A little time spent scaling the  wood grain and adding some homey details like windows would have helped the cuteness.  There it is.