Jim, Dave -

Just checking the arithmetic, without specific reference to a VO or White ENO crank and spider:

I used a Spa cycles (Stronglight/Sugino) double crank, which Spa said gave a 43mm chainline with a 107mm spindle. To get my 54mm chainline, I added

*11 mm* to the driveside length of the spindle, i.e., I used a 118 mm spindle, mated to a Surly 110BCD 5-hole ring (first 38T, now 36T).

Am I missing something?--why double the difference between spindle and and chainring centre?

So,

If 113 mm spindle gives a chainline of 47.5, and Rohloff wants 54. So we need another 6.5 mm

From my experience, we'd add 6.5 mm to the 113 mm, for a spindle length of 119 or 120.