It's been my experience with custom made for me bikes (5), is that I give the builder all my details; weight, measurements, fitting results, etc, tell him what kind of riding the bike will be used for and let him build the bike choosing the tubing he thinks is best for what I'm doing. The only thing I will control in the process is the color of the paint. This is all assuming your builder is skilled in doing that. The builders you've listed, with one exception, seem to be so.