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Not really sure what you are asking here Brendan. Do you already have the optics or are you starting afresh.
Reason I ask is that I have had a 10" f5 optical set for yonks, and this same set has spawned a multitude of tube reincarnations. The latest C/F tube you saw is just one of many, believe me, LOL.
Now in the weight savings class, the biggest weight in my case is the primary, it is 5 kilos alone.
So, if you are starting from scratch look at the conical designs out there, Royce being one. In my mind (and limited tooling as well), they are simplest to attach to a cell.
If you already have the optics then you are sort of stuck, and really can just build what you are suggesting, truss possibly, or solid but light single piece tube.
From the archives, I built this hair-brained middle of the night design up, worked OK too, but it now resides with a friend (I think).
I have other pictures, and certainly hair-brained ideas if you feel the need to delve deeper.
Really, with my limited tooling, and basic skills, it wasn't that difficult. With the tooling and skills I perceive you have it will be a breeze.
Gary
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