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Ian,
while a strong tube is a must, I wonder if you are making it too strong. The rolled tube will be a good start.
Then stiffen the ends (mainly as that is where I "handle" it from), and the areas like the tube ring areas, and possibly the focuser. For the focuser I would just get another section of the sheet and roll it to the same radius, and then contact adhesive glue it inside. Tube ends I would use a thin section something like 25x1mm or similar, and glue there as well.
All of my recent projects have had a selection of interior baffles as well, allowing the baffles to be glued all the way around must add some stiffness, as well as making me feel better about reflections.
Remember to take plenty of piccies.
Gary
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