Am not sure what they are needed for - am assuming its fairings and not structural. Have you considered rolling your own from aluminium? If you have access to a lathe then making rolls should not be difficult. Here's a link to someone who has done it which may provide ideas:
http://aero-craft.org/testJoomla/index. ... d=88#11131
If it's for fairings have you considered hot wire cut closed cell foam with a glass/epoxy covering? Am sure that you could get one of the model plane foam-wing makers to cut the foam.
regards
Colin
Streamlining tube
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