[lincpimp]

Ok, correct me if I am wrong, but the purpose here is to reduce the load on the bearings and shaft of an outrunner motor?

The gearing will not be used to alter the ratio?

If so I have a much simpler idea to help the bearing stresses on the outrunner. If your outrunner has an 8mm shaft, mount it in the chassis with a std mount from the non rotating end. (just like any direct to diff outrunner would mount.) Then make a pair of bulkheads that fit on either end of the motor, and are mounted to the chassis. Place large bearings in these bulkheads that have an 8mm id to support the shaft of the outrunner. Then just place some sort of outdrive on the shaft and use dogbones to connect with the diffs. Motor is mounted low, no addl gearing to fuss with, less rotating mass, and the shaft is fully supported by the bearings in the bulkeads, not by the outrunner bearings. All the outrunner has to do is fight the rotational torque, and a decent motor mount can handle that. Plus the bearings in the bulkhead can be big, and wide. You may need a longer motor shaft to get everything to fit, but that is easy to find/make.