Murph,
it was a simple cut-out of two sections of "foam core", at least that's what I think it was called. It was about (I can measure a scrap I think I have left over), 20mm or maybe 25mm thick. I cut them out, and fitted/glued in the threaded inserts at the appropriate places for the collimation bolts as well as the tube attachment bolts. Then simply pained on the resin and laid some scrap C/F weave across. Another coat of resin after I smoothed off the splinters of weave sticking through the resin and it was done. Not elegant, but it works.
Gary
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