Here is my machine. People are calling it a frankenstein for some reason...
The frame is an SE Draft Track Frame (steel) with a Manitou Dual Clamp Mountain Bike fork with a disc brake. Origin 8 cranks, and Merritt BMX pedals. The back wheel is a coaster brake wheel. Bmx handlebars and stem. www.bekits.com
chinese kit. Its a blast. It stops great with the downhillfork and the disc brake. Its got excellent tires pumped up to 100psi. Its fast enough.
I plan on adding a larger back sprocket to make it a little quicker, and perhaps some other engine mods. Right now I need to modify a seatpost to be laid back.