Regarding the skived leather, most good leather suppliers can do this. I believe GAHH might have biggest skive machine and can do 14" wide x 36" long. That is about as large of a piece as most do. I sent a potion of my leather to GAHH for skiving and came out well.
Keep in mind that there is only a limited need for skived material for these cars. You only use it when you have to (tight corners, radius', etc.) because it has far less strength and less resistance to tearing than the standard thickness.