Yes, this is a belt-drive slider dropout 650 wheel mountain bike frame that will sport a Shimano Alfine 11 drivetrain. Have I made many of these ? Actually this is the first one. It has a curved top tube for increased standover room. The rider is 5'3 1/2" so this was the thing to do.The bike will be fitted with a 120 mm fork.
All of the interesting hardware is from Paragon Machine works: The head tube, BB and dropouts. The post mount on the rear is a fairly new feature.