Old advertising literature seemed to point to the Honda CM400 being an homage to old brit bikes. In reality it was a cruiser-ish standard with a slightly curly stamped frame and an ok small parallel twin. They've become pretty popular for bobbers, and that's about it. I've seen some compelling builds on Do The Ton for these bikes though. Because very little is available over the counter to turn a CM into something it's not, owners have gotten creative.
This is one of the simpler ones(IE least cutting) and it's one of my favorites. I'll get more pics eventually, but it's a nice bike, good attention to detail, and looks a heck of a lot more like what the advertising literature promised.