Here's another off-beat arrangement. An engine built into the wheel hub. I don't see too many of these around anymore. Maybe they're more popular in Europe.
You want a sexy bike? Here you are, the Tagun from Hase Spezialraeder. Long wheelbase recumbent with underseat steering and mostrously high-grade componentry. And it's just a friggin' Cadillac feel. Plus it'll blow that bike of yours away lol.