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Alex,
Re cable drives for the roof.
I haven't fitted a motor to mine (yet!) but just pull to open, pull to close.
The ends of the "cable" are fixed to the centre of the moving roof, one at either end.
The cable then goes over two pulleys mounted on the observatory wall and looped downwards.
Pulling one direction moves the roof back and pulling the other side of the loop "pushes" the roof back into place.
I was going to wrap the "loop" around a winch drum to power the set-up....
I can give you a quick sketch of the cable arrangement.
(My roof is 3 x 3 mtr)
Ken
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