[gchappel]

You could spend years building a custom bike. Most of the custom frame builders are a year or more behind. The new bikes are just better. Especially brakes. Just better.
Get a "relaxed" fit bike- less reach and a higher stack.
Go ride NOW, especially if you want to do 100 miles in 6 months.
Then take your time and build your custom piece of art.
Two different processes.
Enjoy the journey
gary