custom 650b cx for mi'lady (geo help appreciated)

did some calculations. She hasnt complained about toe overlap with her current

• 650c, 165mm chainset, spd / straps & cages and 537mm front center.
  
  

from this with the magic of mathematics we get:

• With 23mm 650c tyre the distance from bb to tyre is 227mm
  
• my v1 cad drawing of a 650b cx bike leaves us with 236mm
  
  

so maybe that 570mm front - centre isnt set on stone. I should be able to shorten the bike a bit. It still has some unwanted features of mini bike geo'ness.

edit added geo 2.0:

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