I recently emailed JT about the same things, my biggest gripe was the X axis design. The centering ballscrew would be a great mod, though I'm still unclear how it would be sold as an upgrade? (e.g. complete kit, plans with instructions, etc.)
I didn't hear anything on the gib strips though & I've spent about 2 weeks getting the X axis gib straight.
Now if JT would either counter-balance the whole upper assy. or go with whoever came up with the gas spring idea. I think that would be one nice machine!!!
You mentioned the VFD inverter control system interfacing with MACH III in all motions & directions. Are the earlier machines not capable of that?