Pictures of the YA6 as I was building it. I used 1",3/4" and 5/8" tubing brazed with Eutectic 16 rod. I like the look of large tubes but could have made it with all 3/4" and 5/8" and it would have been strong enough.

The motor hangs under the frame and the SA mount is a separate assembly that bolts onto the motor.

The Headstock is a thin walled tube and I make bearing mounts that epoxy into the tube. The jig is adjustable from 20 to 30 degrees of rake.