Rodriguez builds a really nice bicycle... we are fans up here.
Funny as I was starting to sort out some details for a new 26 inch wheeled touring build and many of the aspects you included were things I had on my list.
We do all those things like build with S&S couplers and fabricate our own eccentric bottom brackets and as I am leaning toward a long tail design, having it coupled would be an excellent feature to have.
Have no desire to build a touring bike with a belt drive although a frame that would handle an IGH or derailleur drive was another essential point as was a set up to run disc or rim brakes.
We built an SS coupled long tail touring bike for a customer last year and it is a wonderful bike although it did not have an eccentric or dual brake mounts as those were not requested.