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Re: The Old Bench Seat
look at pictures of how newer seats are sprung: wire mesh supported on one end by springs in tension.
Look at '50s truck: coil springs in compression to provide bounce. Aka soften the ride of these old stiffly sprung work trucks
if you want any thickness of foam, look at doing it in the modern fashion.
I think a plywood base would feel stiff to drive on, even with cushy foam on top. It would not flex with bumps
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