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Alasdair,
G'day.
I made my light shroud from some heavy cotton material and 25mm plastic square garden lattice from Bunnings.
This square lattice product keeps the tubular shape well when fitted, and it bends easily enough so that when you look through a straight-through finderscope, you can get into position comfortably without pushing the OTA all over the place place with your cheek. (My Mk1 version used core flute which didn't bend easily).
You will need much less than amount in the smallest packaged roll. Maybe someone in your astronomy group has some spare.
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