How is the instruction going? i'm really looking forward to make the gearbox, it will fit perfect in my next car 

Would't Two XL or rc motors be better because it looks like the gearbox needs more torque or speed Than the L motors can deliver

I have to admit that this gearbox I like the most because of its ingenuity and originality. This clearly speaks in favor of the huge talent, patience, and determination of its designer. Leviathan, great job!!! I sincerely hope that you will eventually complete and publish the instructions for the final version and even the first version is very interesting. Overall this is another great addition to the world of LEGO gearboxes.