Once you decide on a disc and caliper, a sneaky trick we used on the round track cars was to use air pressure to clamp the calipers to the disc- - - -then fabricate suitable brackets to mount the calipers to the spindles. Anybody with a little machining/welding experience should be able to do that without a "kit".
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!