So with almost two feet of Z, Eric recommended a fixed point for the threaed rod. Had to stop at Familab and get lessons on using a lathe to turn down the threads.
For last minute changes like this I highly recommend a 10 piece bag of post insertion nuts. I forgot who gave me advice its awesome advice.
So naturally I get most of it together and forget to put the belt on… Which brings me to the question. Can you run a GT2 32 tooth pulley instead of a 20tooth?