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Tytus,
The problems I see are really problems of preference.
1) the way all of that is arranged makes the gearbox need to be about 8 inches in from the wheel base. (so the motor doesn't hang outside of the frame). Now yes, I understand this can be slimmed down if on of the motors is in line with the wheels. None the less, still roughly 2-4 inches at least that the box will be away from the gearbox.
That leaves your output sprocket as a hanging rotating moment. Whether that could really be a major problem can only be seen with testing. Which I am sure you will do.
2) Very small output sprocket? With the motor so close to the output shaft, even a medium-size sprocket may be a tough fit. Probably only a 9 tooth sprocket could fit in such a tight spot and still leave clearence for the chain to be put on.
Remember, these are not insults, nor are they facts. You have not given us any measurements, only angled views. Without at least an orthographic view, it's hard to estimate the spacing and clearence. I am not saying this gearbox will not work. It is very possible, in fact, very likely that it can work. Those 2 points are MY views by what I can see. Yes, I understand you would want a small sprocket on the output for further reduction at the wheel, but how small is efficiant?
There's my critique, nice work Tytus. Both in idea and modeling.
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