Wheel alignment / Track

Adjusting coilovers at the moment, and i need to get a correct frame of reference for lining up the toe.
The front track is 1470mm and rear track is 1450mm.
I was assuming that this meant the front wheels were 10mm further out at each side.
After a quick check this is obviously wrong.
So I need to factor in the wheel width difference.
 
So does this sound right, with the stock wheels.
Offset is the same, so only thing that should matter, is the extra width.
Rear width is one inch wider so 25.4mm.
Additional width from centreline/track would be 25.4/2 = 12.7mm
 
So the outside edge of the rear wheels should sit (12.7mm-10mm) 2.7mm further out than the front wheels at each side.....?

The best way to set your alignment at home is as follows.
source two lengths of 25mm found or square tube at 2100mm long, fishing line, cloth tape. all at bunnings.
measure from ground to centre of wheel.
use cloth tape to secure tube to the front and rear of car at the measurement defining the centre of wheel. make sure the centreof tube to centre of car.
secure fishing line from front to rear on either side of car spacing at 1900mm at either end.
starting from rear,measure from centre of wheel hub to fishing line providing an even gap on either side mai

after you have taken measurements the adjusted to suit, check your camber with a digital level. set your camber to whatever your looking for, then check and reset alignment again. check camber and reset then reset toe settings again.best way to fine tune as they will put each other out when setting the other.
the front track being more than the rear is ok. improves turn in.
set front toe at 0, rear at 4mm in.

This is what i have been doing to get a square all around the car, with string down the sides.
And using a spirit level for the camber.
What a pain to adjust camber! using the elongated holes of the coilover struts, lost count of how many times
i have removed the wheels.....
 
So far i have;
FR
Ride height 335mm (centre of hub to arch)
Camber -9mm (1.39degrees)
Toe -1mm
 
FL
Ride height 335mm
Camber -20mm :D still need to fix this one, and recheck front toe...
Toe -1mm
 
RR
Ride height 345mm
Camber -10mm (1.4degrees)
Toe -2mm
 
RL
Ride height 345mm
Camber -10mm (1.4 degrees)
Toe -2mm
 
All the toe measurements are at best +/-1mm, with my dodgy rig so im leaving the toe in the negatives all around.
Camber and ride height are quite accurate, toe is a bit harder but its easy to adjust once you figure out which way to turn the locknuts :D
 
Rebound  adjustment, i just picked some numbers...5 clicks from full soft at front and 8 clicks from full soft at the back...

Yeh those moveable plates would make it so much easier.
I checked the garage floor, all good except for one corner, stuck a board under that corner.
At the rear the camber doesnt change much with the toe setting, but front does.