If needed, the fold up panel can be made from 1/2" ply pretty easily. It is surrounded on the top and sides with metal trim and almost a full-length hinge on the bottom. One spring loaded latch holds it up.
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Driver side interior corner height........
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Center height............
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Width...........
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Bottom angle cut..........
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My '69 standard interior deck from the rear. No carpet on the side panels.............
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