Here's some case makers you may want to investigate:
Black Hills Custom Cases
Castillo Leather (Chicago)
Chas Clements (Aurora, Colorado)
Dani Sanchez (Spain)
Dennis Swift (Kentucky)
DW Cases (Phoenix)
Fellini
IB Cue Cases (Spain)
Ivan Belmonte (Spain)
Jack Justis / Justis Cases (Fort Lauderdale)
Javi Lopez (Spain)
Jim Murnak
John Hager – J. W. Hager & Assoc. (Dalton, GA)
King Custom Cases (Canada)
Marcus Chamat (Spain)
Nittany Leather (Bellfonte, PA)
Ron Thomas (Lafayette, LA)
Rusty Melton
Tony Drago (Spain)
Victor Tapies (Spain)
Whitten /Tom Whitten (Tampa)
The list is a bit old, so some may no longer be in business, but .... it's a start!
You may also want to check out the Cue and Case Gallery and Case Reviews forums on here.
Good luck.