I'm not a sporran maker, but if this an out-of-country hunt, make sure you know tha applicable US Fish and Wildlife and USDA import regulations for when you get back. It's never fun to make the trip, bag your limit, get a couple of nice trophies/hides, and then lose everything when you come back in.
Also, in some cases, USDA regs state that hides have to be treated a certain way in order to be enterable, so treatment may not entirely be your choice.