I don't think the fact the front and rear track can be changed matters, so long as the kart is centred inside a perfectly square box. Imagine, for a moment, removing the rear wheels and we have a 2m long rear axle. This rear axle will be one of your parallel bars. The other is situated in front of the kart. run string between the two such that a perfect square is formed. Measure the toe relative to the string and, regardless of track widths, your toe settings will be aligned perfectly with the rear axle.
In fact, with the parallel bars method, you ensure both chassis and rear axle and front wheels are all perfectly aligned with the direction of travel.
Am I missing anything?
Dave
PS Having said all that, I wouldn't waste my time and just track it up using the normal methods.
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