Summary:
I am glad that I took the time to make a rotisserie. Without it I don't know how I could have sand blasted or sprayed the frame. Since the rotary axis of an engine stand is not parallel with the ground (5 - 10 degrees inclined) you have to be aware that using two stands will cause binding if you do not shim the rear casters. Even without shims, I was able to rotate +/- 90 degrees from horizontal.... which was all that anyone needs anyway.
The stands were so solid and allowed so much mobility that I seriously considered starting the assembly on them. I have since changed my mind - the frame is now sitting solidly on jack stands.