I feel like I should call you a cheaper with all that nice stuff at your disposal. I had an engine stand with 4 wheels and a fixture bracket for the trans that I made to do them. If you can't rotate the trans in the right directions.. you really want the correct tools for the job (which I didn't have).
I like to call 4t60/5's a floppy mess that you'd never think would work, right up until the 4th support is in. Keeping in mind these are the only transmissions I have rebuilt, but it amazes me how loose/floppy it is in there until that point.