Finished the Roberts 3-Speed. What a delight.
(EDIT: 1/19/2014 - I still haven't ridden the Roberts more than 10 miles since I bought it. It's still set up as a 3-Speed with an SRF3 hub. I've purchased a 1952 Sturmey Archer AM hub from a seller in England, and only a few days ago did I get around to pulling out the internals to compare them to the internals on the AW & SRF3. My plan is to ride the Roberts with a few different setups to compare the different gearing ratios and quality of the hubs. Then, I want to improve the internals of the hubs with the help of an engineer, a CAD drawing, and a machine shop. It's an old idea, and it's moving slowly.)