For mine, I did a layer of 2x4's sideways on the inside so they're thickest. That was for strength. Then I did a sheet of birch plywood on the outside layer of the baffle for a cleaner look and good seal around the gaskets.
Then braced it front to back with a couple 1" threaded pipes, haha
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Four VP 7k's. B-pillar 4th order and 8 15" Soundrive subs