I have a rotisserie but would not even consider using it for the Europa without some sort of full length reinforcement!
There has been a lot discussion here about thin roof pillars and corner cracking, I can envision the whole car collapsing.
For my own I intend to make a support structure of tube and plate, using the chassis drawing for dimensions.
I've had my Triumph GT6 body on the rotisserie and it was great but even that steel coupe required fabricating mounts for each end.