Moisturizer those scale with several coats of thin mineral oil to take the brittleness out of them before you do anything to them. You could even soak the whole razor in a bath of mineral oil. As for the case, that type of leather work is a little specialized and if your friend is not sure, you could check with a book binder, as it is a very similar process. Everything as original as possible is the general rule. The rest of the advixpce give above is spot on.