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It'll make it easier for you because the strings don't need to be parallel to the car, only to each other (which they will be if you notch the tubes in the exact same distance from each end).
Get some of the fluoro yellow sea fishing line, it's nice and easy to see.
I did a sticky thread on here which has an online calculator that you can use when doing the string method, just input your measurements and it'll tell you what the toe is...
Speed 5 on most DA's is good enough.
Those swirls you've just removed look to be from a poor wash or dry technique, so watch out for that and don't ruin your hard work after polishing.
Have a read here.
https://www.cliosport.net/threads/fault-code-187-trigger-line-problems-airbag.713118/
Sounds like yours is a 2nd hand airbag ecu and has a different configuration to your car. Need to reconfigure to suit your setup.