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Peter that's actually a darn good solution.
Square-section boxes with lids have always been either light but fragile, or robust but too heavy.
Your solution also suggests something else - use a lightweight tube and lacquer the outside, and put some foam blocks inside to hold the OTA in its place. I found some nice high density foam rubber in the form of a floor tile - a few dollars fir one 50cm square - and you'd only need to cut this into a few blocks or rings to hold a scope securely.
A lightweight tube is easy to make - even in thin ply, and with a couple of formers inside quite strong enough ... It would not be hard to accommodate a finder and the focusser.
A good project for a weekend, I think.
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