Also a good trick if you dont have a good straight edge of good straight board etc... laying around, use a couple 6 or 8ft flourescent light bulbs (tubes) out of some overhead lights and lay against each side of the track , if the track is centered correctly, they work good.
What about is the best measurement for the ski alignment, I have 6.9 pilots swapped , toed-out ???
Good Luck, Darren