lanwater:

I was thinking about your question last night…
There is a YouTube video of an individual using a router to carve the seat-edge profile (using an mdf form) – about 6 months ago, I thought about using this approach, but realized it would result in a 90 degree angle from the seat top not-sculpted to the sculpted area: I wanted a more organic flow to it.
I’ve copied-in the Charles Neil ‘scoopin’ a chair seat’ link.
http://www.youtube.com/watch?v=g6DaDGE_FJI