Some friends of mine have 2 custom Seven bikes each. They are quite "custom" with steep sloping top tubes. They have steel road bikes with couplers and ti cross type bikes with couplers. They are really happy with them but I'm sure they paid a bundle. They pack them in cases and go to Europe and NZ with them.
My bf recently for an IF Steel Crown Jewel custom. He's very happy with it but it wasn't cheap.
I don't know what your money situation is but a custom bike is usually not cheap and touring is a very hard life for a bike. They are in all sorts of weather and road conditions, get leaned on everything, fall over, maybe even get stolen. I'm happy to have a cheap and easily replaceable bike for touring (like my LHT), and have a more expensive custom bike for road riding where it never leaves my hands when I have it out.