As long as the leather is still pliable, it should be okay. It's hard to tell from the picture, but I didn't see any flaking... yet.

You can tell from the back of the bag just where the design should go. Hopefully, there's enough "material" on the under-front and sides to complete a whole sporran. If you're lucky, it comes with an appropriate lining too!

After mending goalie pads and baseball gloves, this stuff looks like it's not going to be much of a problem at all to work on. Make sure that the "builder" uses a synthetic binding since this is old, treated animal skin.