Sorry for the misunderstanding
Hi Nick
I did know that was Dyson's original vision of the "Shell" though I didn't realise he called it a "Shell" and not a Cloud. I suspect Adrian Berry is chief suspect for popularising the rigid Shell concept in his "The Next Ten Thousand Years".
I found an animation of complex, but stable multi-body orbits which would be ideal for a Dyson Cloud, but for the life of me I can't remember the web-page.
Adam
