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I haven't got the best photo on hand but hopefully this will explain it. I connected a chain in the centre of the roof from front to back. I placed the garage door opener above the control room and looped the chain around the sprocket of the gearbox. The chain is essentially a bicycle chain so to assist in creating a loop I obtained two rear sprockets for a bike and removed the ratchet from them to allow them to spin both ways.
In this way, the observatory opening is unobstructed and what seemed to be a hair-tearing exercise ended up being quite simple. The motor also has soft start/stop and a remote!
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