Come on y'all in AZ. How hard could it be? Am being serious for a change, so pay attention. We need Bob in a comfortable desk chair to fit his height, comfortable back support & no arms, on rollers, in order to determine correct elevation of the lathe stand. For ref., when seated there is no more than 5" or 6" between my elbow and my leg, suggesting that the elevation has to be got right. Probably elevation close to the legs as possible but still enough room to move and swivel the chair.
Then all we need is some 2x2x1/4" steel angle, crackerbox welder, cutoff saw, a drill, and the lathe mounting bolt locations. What if the chair rolls too easily (had some like that one time)? Put a thin piece of sturdy carpet under the area. This is an easy one, y'all. If it needs to be pretty (my stuff isn't), get it sandblasted and painted.
Not sure if I could turn for 45 minutes either. Usually 10 or 15 at a time, then sit, drink coffee and pet my shop cat for a while. She has her own chair but seems to prefer mine, especially when I am in it.