Well, from the drawing I see the following data:

Flange diameter 92mm
Distance from center to big holes 33mm
Diameter of big holes 13mm
Flange thickness = 2mm???? (guessing what AU4G means, something to do with a duraluminum variant?)

I wonder, are you making the flanges as a pressed-in job, or riveted to the original spoke holes? I can't help but be curious about this, I'd like to do something similar to a Sturmey Archer BF hub in order to even out the flange diameters.