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Hi Andrew,
That design looks familiar!
I did nearly the same thing to a 4" reflector some years ago. Also made a sliding focuser and secondary assembly too.
I can take a pic and post it if you like?
What I did find that it did end up quite heavy, with the stiff aluminium tube and the plywood was 20mm thick.
Think you would need to consider carbon fibre tubes.
Cheers,
Justin.
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