I agree with you about the UTA/truss configuration. I've never been able to figure why Kreige chose the offset-by-45 degrees arrangement. Yes, your approach will allow you to use thinner ply for the rings.
Try to make your UTA lining as light as possible. Every gram of weight up top moves your center of gravity up, which means bigger trunnions, taller rocker box, etc, etc, etc ...
Steve.
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