Hey there Ric
I just had a look at their website. Interesting designs, especially for the money! The little pod is cool, but a little small? Which roll-off design are you doing?
I just emailed Andrew Orngard, (designer & builder of the roll-down roof observatory for the owner, David Oesper) to see if he ever made up plans. He is still in business as an architect, so hopefully he'll get back to me.
Cheers
Chris