Hey @AndrewBrown
I used 2 layers of 1/2” baltic for a total of 1” for 95% of it. Due to the design, it needed a little extra rigidity so i added 1/8” thick steel bands in a few strategic places. You can see a couple in the attached pic. Also added some elbows, trying not to add bulk inside where the vac hose will move around.
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