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When I made my seat i used a sticky back foam that i stuck onto the seat / tail unit around the edge where the seat fits onto and then stretched cling film around the lot, this gave a bit of play you need when the seat base gets upholstered. I then just layered glass fibre cloth approx four layers heavy mat, when dry removed base. The best then is to send it to saddlecraft where they did a superb job of making the seat foam and covering for a very good price, if my memory serves me £145. As you can see from the above photo. This seat fits so nicely it doesn't have any fasteners to hold it down and never comes loose so no need for that wonderful seat clip, unless you want it. Kev
www.saddlecraft.com