I'm making ply/lumber seats for a runabout restoration, and would like to add some kind of shock-absorbing capability to the seat bottoms (in addition to cushions, of course), instead of plain old ply (it seems that 1/2 inch is used frequently). Do you guys think that a thinner ply would work (3/8 maybe?), or some kind of wooden strips? I would hate to go to all the work to make and install strips if they are too thin and just break, or are too thick and don't have any give. Maybe some other non-wood material might be out there that I'm not thinking about. The seats are 18" wide.
I'd appreciate your input!