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I would think hard about installing some sort of breathing membrane to allow for temperature variations. A small opening underneath the panel going into an internalized “balloon” that can expand or contract depending on the atmospheric pressure. This will remove most of the strain on the seals.
Instead of caulking I’d use roofing tar or some hybrid equivalent. Otherwise you’ll have to check at least once a year and re-caulk the panels that have broken the seal.

Mounting the solar cells to the ply-wood might break them if they are too tightly bound to the wood that will warp slightly over time. I’d use a single point mount per cell using some sort of putty/adhesive in the back/center of each cell so that movement won’t break the cells (letting the remainder of the cell floating above the ply-wood).