I have a Baja Warrior with the terrible drum rear brake. A friend and myself are going to build 2 of them for the build off with 420cc Predators. We want to convert them to Disc brakes. The drum is a welded part of the wheel. I am thinking that welding a plate onto the edge of the drum and then chuck it in the lathe to face it and turn the OD we need. I may have to make the weld on piece with some offset to clear the tire with the caliper. Any suggestions or thoughts? I am thinking a 7 or 8 inch Go Kart disc but I don't think a Go Kart style caliper will work. Maybe an ATV caliper? We will probably end up installing disc front and rear. I guess we will just have to start mocking stuff up.