When I built my first profile I was inserting the wing into the fuselage and took forever making sure it was lined up dead on in the middle of the wing and that it was exactly the same distance from the wing to each elevator half. I measured a million times before applying the epoxy.

The next day after the epoxy has cured it hit me that I never looked to see how the wing lined up horizontally with the elevator. The left wing was a good bit lower than the right...DOOOOH!

There was nothing I could do about it at that point. So I finished the plane as is and it has been my favorite plane so far, despite the significant flaw.