This 3 volume series of wonderfully illustrated books is basically a course in custom case making. They are all written and illustrated by the great Al Stohlman.
The Art of Making Leather Cases, Volume 1:
This first volume begins with techniques for making small cases.
Learn how to make small leather cases for knives, cameras, calculators, flashlights and more. 120 pages. Heavily Illustrated.
The Art of Making Leather Cases, Volume 2:
Learn how to make leather handles, install zippers, attache cases, brief cases, bowling ball bag and more. 125 pages. Heavily Illustrated.
The Art of Making Leather Cases, Volume 3:
Learn how to make rifle cases, guitar cases, a golf bag and all the other articles featured on the cover. 116 pages. Heavily Illustrated.