YouTube recommended this video for me this morning. A very interesting 48-volt electric trike commercially available in Germany and the Netherlands. There is something very sexy about the shape and upon further investigation of the websites associated with it, there is a very nifty roof option. Scaled up and with different (leaning) suspension geometry, this is close to what I am building. Although I really do like my Streetliner Concept #2, something more akin to this shape should be explored also.
http://www.sunrider-cycles.com/
http://aerorider.com/index.html