Thanks Mark. I'm set up with 44/28 and a 115 mm spindle length. After installation, I've decided that I could easily go with a 113 mm and achieve the chainline recommended by White Ind.
I don't know if this will necessarily translate to your bike (nice build, by the way!). For one thing, I have an ENO (mountain) crank rather than the road VBC model. Also, my bike is a new 26"- wheeled model with longer chainstays (than earlier 26" Atlantiseses). I'm thinking the longer stays allow for fat tire clearance without the dramatic curves of the older models, and provide a little extra chainring clearance as well.
It rides wonderfully.