[TubaMorg]

I always like the idea of a shaft drive. It can be quieter and requires less space and can be more reliable when put together well. I like the bearing support at the drive wheels. Some additional considerations: The drive pinion is ok, but should probably go to a larger gear, use the final gearing as a factor for the transmission. Also, you should consider incorporating a thrust bearing to absorb axial thrust. One other consideration. long shafts need more bearings for support. Have you looked into using a hollow shaft? There is always a certain amount of torque involved which a hollow shaft can absorb better without breaking. Or if you want to get really fancy you can use a quill shaft (you'll have to look it up). A quill shaft is essentially a shaft within a shaft that extends the effective length of a shaft. Length is good because that, too, increases torque flexion which reduces breakage.