Isdmt
I was just about to ask the exact same question (well, except for the SE Asia part). I'm in the DC area and also looking for custom touring bike w/couplers. I only have room for one road bike in the house, so the touring bike will have to act as my normal, everyday bike as well. I'm not sure about your case, but I'm actually looking for a more upright riding position and am fully prepared to ride slower if necessary.
So far the only framebuilders that I've found are as follows:
Bilenky:
www.bilenky.com/
Spectrum:
www.spectrum-cycles.com
Havnoonian:
www.hhracinggroup.com/ (The webpage is old and outdated)
Spectrum is known for producing an amazing bike, but they're more expensive. I haven't been able to find much information on Havnoonian, but their bikes are much cheaper. They're more known for their track bikes.
To add to your question, can anyone offer any opinions as to the quality and fitting of Bilenky vs Spectrum? Is Spectrum worth the extra money? My biggest goal is to get a frame that fits me as perfectly as possible