Once I started to attach the components, I began to discover the problem areas. First, I realized that the 5mm spider axle could not stand up to the tension from the timing belts. Secondly, I realized that due to mixing different pitches within the differential led to different tensions from having different diameters. I anticipated this result, but it was just one of those things you had to see with your own eyes (trial and error). Thirdly, since designing an axle/differential requires separate shafts, the joining of the shafts were not satisfactory in that the solidity was questionable. With all things considered, different components have been ordered and as soon as I receive them I will put them to work