Cafe Racers have always been an interest of mine and one of my favorite Cafe Racer websites is Bike EXIF. I subscribe to their RSS feed here at Faceyman.Com and I also follow on Twitter and Facebook.
Recently, I came across this article by automotive designer Charlie Trelogan called How to Build a Cafe Racer...it is one of the better articles that I have read. Check out this Honda CX500 build and the basic design principles associated with Cafe Racers.