Wow man that gear box is genius for real! You should put these up for sale I mean look at all the YouTube projects on here where the guys build a great project but don’t know how to add reverse so they just don’t have it I mean even “rather be welding” built a great street cart with no reverse, can you imagine no reverse on a street cart that’s too heavy to lift I guess you could get out and push it lol. I’m not saying this box is large or strong enough for his project but my point stands besides if you can built that one I’m sure you could make it larger but idk maybe that would work who knows.