Make a leather advent calendar

Hi I was wondering if you could give me a quote to make a leather advent calendar. It is my 3rd wedding anniversary on the 1st of December and I proposed with an advent calendar should I think this would be perfect, but I don't know where to start. I was looking for something around 75cm x 100cm Then have little pockets around 14cm2 – but they can be random sizes. Or if might be easier to make it as a box type like a leather book.