Don't get me wrong, this is not about saving money. I just hate not being able to figure out a way to do something myself. In fact, now that every body says, and I will take it to a front end shop in the end, I guess I will HAVE TO figure out how to do it myself!
My chief question still stands though, where does the caster angle measurement come from. On a solid axle it is the kingpin angle and is easy to find. On these independant front ends it looks like it is the rake of the angle of a straight line drawn through the ball joints. The problem is that the spindle is offset from that line, so perhaps it is the difference in angle from the line through the balljoints(kingpin angle) and the line from the upper ball joint and the spindle. Just speculating here though. If anyone has the actual answer I would love to find out.