Remember reading in 'Bike' mag about a guy who made a plaster cast of his arse after sitting in a tray of sand. From that he made a fibreglass seat base. Fitted to a Kawasaki triple with minimal padding he claimed it was the comfiest seat he'd used. Always thought it made sense - might get around to doing it one day, fixed to standard Commando seat base and then topped off with upholstery and padding, should be very comfortable.