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The soarer upright has a 12mm trail offset from the kingpin line, i chose a 5 degree trail to match a caterham, 1.5 degree neg camber to match caterham, the steering arm is 132.9, racks stroke 62.5 each way.
For each 25mm fore or aft movement of rack behind the axle centreline i get an increase or decrease of 1.1 degree of anti ackerman (per side) , never does it reach neutral or toe out ackerman.
My rack position ranged from 70mm to 145mm from behind axle centre, at 145mm the control arm angles started to get a bit skewed.
Rack length knuckle centre is 482 which is in line with the proposed inner wishbone centres.
Id try locostbuilders website but its all fluff and guesswork over there, there are alot of real engineers who frequent this forum.