The method I've shown with the square tube was only used for the toe-in adjustment (measuring the difference between the fore/aft of the disk) side to side.
I bought a cheap camber gauge from Amazon to set my camber/caster for the front (and rear as well).
https://www.amazon.com/KIPA-Adjustable-Alig...l/dp/B07715X191I may have misinterpreted your question; to set the camber, I set the "approximate ride height" to the A-arm at a perfectly level position and set the camber/caster at that position. Lastly, I set the toe-in.
Hope this helps! (This was intended to get the alignment as close as possible prior to an optical verification/final adjustment.)
EDIT: For clarification, the torsion bars were not installed when I did my alignment work...they were re-installed after the alignment was completed.