Ok, I'm a little bit scared hearing about drilling spars and drawing lines on the floor! My process is to level the main spars width wise, level the main spars length wise by the fishing line across the spar flange rivet holes, then measure with this "plumb bob" on each end. I'm still monkeying with it because when I clamp/bolt down the outboard rear spar end it changes everything so I'm slowly adding shims to that bracket. Clear as mud? Hope that sounds about right. I don't have any experienced help nearby so I'm learning as I go thanks to this website. Steve, its an 8 and I think the prepunched kit eliminates the need for a true jig and alot of the alignment issues you had, but rather a stand for easier access and measuring. I am open to and appreciate suggestions! Thanks for the tip CJ!
Kevin