Today I completed the fuselage jig. I leveled the jig across the length and width. I noticed that some of the cross-members were uneven. This required a few slight adjustments and shims to get everything looking good enough to build a straight plane on.
I also replaced the original 2x6 pieces at the front. The ones I got with the jig were pretty badly crowned. I picked up a fresh and straight board from Lowes. The front legs are now straight and square.