S90: The Seat Must Go

My guiding policy for both these restorations will be to never replace parts that can otherwise be fixed up, repaired, or refurbished.  The whole point of this project is to build up skills, tools and knowledge, not just to replace every rusted part of the bike using eBay and a credit card. 

That being said, the S90's seat is pretty much beyond all hope.  The metal pan has turned into loose layers of rusty sheets.  I think the seat cover and cushion are actually holding the pan together instead of the other way around.

Had to take some good shots of the underside so I can make sure the hardware and bolt holes line up to the eventual replacement.