Not a lot of space. 2 1/2 inches.
If you replaced the board with plywood/MDF and had a support in the middle, you could get another inch. The board is a hard foam that is quite thick. I didn't measure, just going by looks.
If you replaced the board with plywood/MDF and had a support in the middle, you could get another inch. The board is a hard foam that is quite thick. I didn't measure, just going by looks.
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