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Im not talking about visual use as if your doing photography that is the limiting or critical case
Use PLOP for the mirror cell design, its simple really, you need a solid base on which sits the tiltable cell Ill be making one for my newt very soon.
As for the Serrurier truss. Read why it is and how it works as i think youll have to have a very strong grasp on structural engineering to do it properly the way it is ment to work aka both ends flex the same amount to keep the optical axis on par. Also stay away from aluminium for this as youll get shot on expansion. if it was me i would get 2 rings and lock them in with two bars like a RCOS RC then carbon truss upto the top with similar cage as the bottom that way it will allow your balancing to be in the approximate right spot for your forks and also allows you to effectively baffle and block light
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