Robart meters ?
phooey worthless as teats on a boar.


assemble the plane
set it level stand directly behind it - loook at light n shadows above and below the wing panels
If you position the light and yourself correctly -you can see extremely fine differences
far better than those clumsy incidence things.
better than yo can measure with a ruler


OR ask an old woodworking craftsman to come and take a peek
he will show you haw to see alignments down to a few thou-

I use this technique becaus you also see any hinging errors .