My project came with the lower wing in a wing jig. The jig was well built but old and had been moved multiple times. I need to level it, stengthen it, and Bondo it to the floor before continuing with the wing construction. I supported the jig under the spanwise 2 x 6's with trailer type screw jack stands. After the jig was completely supported on the trailer stands I removed the 2 x 6 support legs one pair at a time and reinstalled them so they were resting square on the floor. I finished about half this job before bedtime.