Although you may not be a bookbinder as such, you're still making covers for books, so you're at least part way there! Bookbinding leather is usually quite thin (comparitively speaking), better quality and has been specially treated. It moulds very well and also takes tooling. Hewits sell a lot of small leather working tools too. If you're ever staying in the Edinburgh area on a future visit, it's just a bus ride from the city centre. They have a website HERE, which will give you an idea of their range, but they don't show the low value skins on it though as you really have to sort through them to find what you want.
I've never been to the Isle of Islay, I know the south of Scotland reasonably well as I don't live too far from it, the furthest north I've ever been is Inverness.