I would just use a polyester resin to glass plywood blocks on with. Epoxy will work too, but is not necessary.
Either way, you want to thicken the resin, to aid in filling any gaps or pores. Without a filler, the resin would be too thin and runny.
Afterwards, if you want the blocks to the very solid, you could put a layer of fibreglass over the top of the blocks. Probably overkill, but it sure would not hurt.
Done this way, I bet you could get away with 3 short blocks on the exterior wall. You wouldn't have to go the full length.
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