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I appreciate the help. I found the rebond foam (firm lower layer) online, and I think I can get it locally in the form of a carpet pad if I don't mind overpaying.I'm kind of wondering if I can cannibalize an old ab crunch board for the upper foam. It has nice firm foam on it, and nobody does crunches any more.I know an old Cuban guy who does car upholstery. I may run it by his shop before making myself crazy.
If you want to soften the seat a layer of 1/2" to 1" foam under the stock seat foam makes a noticeable difference. You would slice 1-2" below the top from front to back. Remove some material and glue in the new foam. Use an electric knife to trim the excess and blend the different foams together. If you put it under the existing foam there is much less shaping to do.
Didn't happen unless there are pics.
A firm well shaped base of foam covered with a thinner layer of soft padding makes a comfortable seat.