I like the suggestion by John Lucas on tilting the lathe. I use one of the hydraulic carts from harbor freight and it sounds like a good way to set the lathe to the desired height, however there are also some problems. The most significant would that the hydraulic cylinder can sometime creep and potentially trap someone under the heavy weight of the table. I think that some locking braces would be mandatory to insure that this does not happen. A permanent minimum height lock on the scissor mechanism is another way around this issue. Another issue is one of convenience and independence -- how to raise the table since it is foot operated. It can be done, but would take a bit of ingenuity in design to meet your needs. Finally, there is no chair or foot room underneath the table so there would need to be an extension shelf to cantilever the late out several inches.
One of the main disadvantages of using a typical mini lathe (or any other standard lathe design) that is addressed by the Oneway is clearance between between one's lap and a reasonable turning height. When in a sitting position, there is only about four inches clearance between lap and elbow when the elbow is near the torso. This presents a problem for many lathes such as the Jet mini where the clearance is on the order of a foot between the spindle axis and undercarriage. Don't forget that the motor gets very hot so it needs to have adequate clearance from contact with any part of the body. The motor could be moved tot he back side of the lathe, but that still leaves more than eight inches between frame and spindle axis.
It is becoming evident that the time and expense of modifying less costly lathes is making the Oneway increasingly attractive.