I've been flying my Ultimate for 3 years now, and it's still a favorite. The way I got the wings aligned was along the lines suggested for truing the wings. Put a pin in the tip at the leading edge and the trailing edge. Make sure you get them centered well, as the next step depends on accuracy. Assemble the plane, and measure the distance between the pins top front left to bottom front left, top rear left to bottom rear left and so on for all 4 distances. Adjust the mounts for the interplane struts until all 4 measurements are the same. I did it that way, and I needed no aileron trim and only one click of elevator trim on the initial flight.

HTH
Jim