RE: custom calls?
Kaiser makes a beautiful call...lots of care go into the pots he turns out.
Wendell Rye of LightsOut calls makes some of the most awesome slate calls I've been around. He can get and use about any wood you want, and you won't work with a friendlier guy. He also makes some very fine strikers. You can find his stuff in Midwest.
For the cream of the crop check out the line of Supreme Calls by Steve Reeves. You buy top dollar for them, but they are absolutely the prettiest and best sounding calls on the market.
For a box call, either Bob Harwell or the Doug Camp company (Doug has passed away) make some fine, fine boxes.