Depron for me is available in two thicknesses only ... 3mm and 6mm ....
My thoughts are that 3mm laminated with epoxy with another 3mm should produce a 6mm wing or structure that has far more stiffness / strength than a 6mm sheet version.
It may even be enough to not need insert rods etc.
My Concorde and other models have used this idea but I still added BBQ skewers etc. as I was using non-resin glue. Flex was still there without rods.
Change to laminating epoxy could the answer ............
Anyone use this idea already ?