My advice - do it BEFORE cover & paint.

The manual suggests covering and painting the empennage after covering and finish painting. I followed the suggestions in the very nicely done and helpful series of build tips by "Chuck & Ryan" and it's a good thing I did. Picture shows the misalignment of the elevator horns.

All the parts in my kit manufactured by Cubcrafters fit perfectly, but the horizontal stabilizers and elevators are made by Univair - and their quality control sucks. Mitch was really good about immediately sending me a new set when the problem was identified. It would have been really pissofficating had I discovered this problem after they were covered and painted.003.jpg