Great job,
You have been a busy little Vegemite, (Australian saying) and one hole out in that many gears is jolly good IMO. I have not needed to make any gears or threads for that matter as yet so it's good to see a good example.
Current project for me is Elmer's simple beam (#24) I think. I am learning heaps doing work-a-rounds to correct, or at least cover my blunders.
Some of them come from taking an imperial set of drawings, doubling the size and converting to metric. I didn't redraw the plans, just converting on the fly. The rest from getting carried away with the fun of making swarf.
John B