Looks like a pretty well thought out design for a "Gunsmith lathe", particularly the 1 9/16" spindle bore and the centering screws on the outboard end of the spindle. I would try to find someone who owns one to get some feedback before I pulled the trigger though. The other issue that comes to mind is getting a machine that big (heavy) moved into where you are going to use it. Be sure to get the front to back measurement so you can measure door width (learned this from experience).
