Since you asked....If I were you I would take a long hard look at the Sargent site and think about getting a chunk of their foam.
Here is clip from an email I got back from them when I had inquired about raw foam stock for a seat on a custom I am building. Their site has a lot of detail on how to mod a seat in anyway imaginable. Cut it down, build it up , insert it..they show it all!!!!!!
Check it out a
www.sargentcycle.comFrom: Bill @ Sargent
Sent: Wednesday, January 31, 2007 11:58 AM
Subject: Re: question on foam
Hi Paul,
We do offer raw Super Cell foam in 12" x 12" x 1.5" increments for $19.95 plus shipping.
Check out the Case Study on the lower half of our Custom Seat Services page. There you will see an example of how we install the Super Cell and can keep the seat the same shape.
Please call with questions.
Thanks for thinking of Sargent's.