[asid61]

Can you swtich to COTS shifting gearboxes? A good portion of the advantage of a six cim drive is lost when using single speed, because going at any speed where the acceleration difference (between 4 and six cims) is not negligible is just asking for breaker blows.

On another note, that's a really good weight and design. The way you are fitting wodden plates together is very novel.
How do you make the correct tolerances on everything?