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I think Rolf's scope would be the best to copy, mines a bit more tricky being mostly carbon. Personally though I would put a layer or two of carbon on either side of the ply rings to make them really stiff with the rear one being most important. I needed to do this on my only ply ring(at the rear) in my scope as I had some collimation shift when moving it around the sky. This is because the truss poles have 4 points of contact on the ring but the mirror cell only has three so it needs to be very stiff.
Rolf say he doesn't get any focus shift with his alloy poles so maybe the carbon poles are over kill. Alloy ones are easy to work with to.
In the end when the scope is all made and it's stiff and holds collimation well there is still one thing most people go past and that is a really good coma corrector, without a good one all your hard work will be wasted. Bite the bullet and get a Televue paracorr type 2.
I have no problem with the idea of buying a gso 8" f4 imaging newtonian and using all the parts, that should work fine.
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