I'm thinking that the side-ribs only have to help bow out the sides... they don't have to bear weight... so PVCor even PEX could help there.
Sandwiched floor-weight plywood bound with Marine glue could make you something pretty damned stout as a 6x6. Using 3/4" plywood it would take 8 layers to get to 6", and fully solid pieces would not be required as long as you offset joins.
If you use gorilla glue it will be even stronger, but you'll have to clamp it tight, Gorilla glue tends to shift unclamped wood quite a bit.
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branchandroot
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Date: 2007-02-07 09:45 pm (UTC)Sandwiched floor-weight plywood bound with Marine glue could make you something pretty damned stout as a 6x6. Using 3/4" plywood it would take 8 layers to get to 6", and fully solid pieces would not be required as long as you offset joins.
If you use gorilla glue it will be even stronger, but you'll have to clamp it tight, Gorilla glue tends to shift unclamped wood quite a bit.