My other thought is if I could make a smaller internal ply box, then add rear and fill with concrete/similar.
However, that doesn't deal with the UV issue, or possibly that I'm reinforcing the wrong side their design intends.
I should probably just make one out of decking boards then leave whoever buys our house to deal with the collapsing structure.
You can buy some from Woodblocx?
@hugo7 started
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My other thought is if I could make a smaller internal ply box, then add rear and fill with concrete/similar.
However, that doesn't deal with the UV issue, or possibly that I'm reinforcing the wrong side their design intends.
I should probably just make one out of decking boards then leave whoever buys our house to deal with the collapsing structure.