FWIW, I've built a "reflex" roll-off roof(?) I have effectively divided my available 3.5m by 8m ground space into two. One half is set up for the pier and scopes, while the other is my 'control room'. The control room has a fixed gable roof, but the viewing room has a higher sliding roof that slides back over the viewing room roof. ( I did/do not have space to have the roll off section hanging out one side when viewing.)
Also my horizon is not particularly clear, so my concrete pier is quite tall, and I've built a raised timber platform around it to walk on. Generally though imaging close to the horizon does not produce good results.
Built in stages, it was not overly expensive for me, I'm guessing about $3k all up.
A couple of pictures attached at mid-build.
I can provide more detail if interested.
BC
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