How is the internal hub holding up for you? I've got a 5 speed automatic. You may be able to make yours automatic with a Kilduff auto shifter. I custom built my 5 speed freewheel. (34, 28, 24, 20, 16). I use a Staton Inc kit and a LandRider derailleur.
Your bike looks really nice I hope to see some videos of it soon.