Front end alignment at home

I've been setting Toe for years on all my cars with just fishing line, ruler and 1/8 steel & grease slip plates. Too easy to pay someone.
But never had an accurate way to measure Caster, at least one that I was confident in.

So when this late 80s Hunter F111 optical popped up on Craigslist for $300, I grabbed it. The first few times it was a pita to setup and calibrate each wheel sensor without having a real alignment rack. But after some trial & error and ruining the 2 front tires on my Focus ST, its working good. I plan to fab up 12"-18" tall platforms to sit the car on to make the process a bit easier

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