Hey Bobby,
Nothing wrong with making your own pan, but why go to all that effort....They take an awful lot of time to cut bend drill and powdercoat, when you can buy a great one for $60 or less. Neoprene.... I use Foam and More in Troy, MI.
If you want an old style pogo style seat pan look up Spitfire Customs..... Ask for Bill Schalk Sr.
Dave