[Chris is me]

Originally Posted by Chak

Yes, but that cantilevers the gear. And cantilevered gears, like the one on 1296's 2016 gearbox or the one in vexpro's ballshifter gearboxes, tend to shred gear teeth, which to my understanding is because of deflection. This can be solved by steel gears, but I thought that not cantilevering the gear was a more elegant solution. Either solution will probably work, so I picked the one I liked better and was more fun to CAD. I don't know for sure, but I feel like not cantilevering the gear is better over the long run of the gearbox.

It is a bit more complicated than cantilever = shredded and not cantilevered = OK. It depends on how well supported the shaft is when cantilevered, how far the load is from the shaft, etc. I'd be inclined to think deflection from the loading being placed on both sides of the gear might sort of cancel out? Regardless this approach is probably fine, just be careful to make sure the inner bearing is very carefully aligned. If bolt holes are the only thing constraining that bearing in place, that might get tricky to line up as you assemble the gearbox. Especially if you are running this with a third bearing in the drive tube / plate / whatever.