Oldacura,
Seven recommended that we go with two 26" x 26" x 12" cases. We disassembled the bike to test packing it. There is lots of room left to fill with helmets, clothes and other items. The 12" cases supposedly aren't airline legal so I will find out soon what type of hassles I get with them. They will be under the max weight limit.
We are using Avid BB7 disk brakes that are mechanically operated not hydraulic. All cables have two splitters on them so they break apart in the same places as the frame.