Thanks heaps for the help.

Mudboy - why should I go with Round or R-O-R chainstays for a touring frame? I was going to use 24mm oval stays with .9/.6 wall (like these http://www.cycle-frames.com/bicycle-...0.6-X-425.html ). Should I avoid this? And you are right I forgot to factor in the length of the dropouts into my calculations, so 425mm should get me over the line with ease.