I'm not far off 7ft tall but I get your point :D

I guess I was wanting it to do everything, but that's obviously not going to happen.

I've just been looking at your vertical machine on YT Jazz, it's a beast. I'm just looking through the options for dealing with whip on the long axis, so will probably go with thick ballscrews. I think the step up in price will still be cheaper/easier than a rotating ball nut.