As a follow up question to the conversation....my internal plan for building the seats is as has been mentioned before, a low-pile piece of carpet for longevity and spreading the pressure around, then I was thinking of some high density foam, then batting over the top and sides to round it out. Anything I'm missing? Any thoughts that I am on the wrong track? Any idea what thickness of foam I need? 1", 2", 3". Again, will be using a pre-sewn seat kit.