Jason is modifying the horizontal stab. He’s moving the location of the leading edge attach point up to meet the leading edge of the vertical stab. This will give him approx 7 inches more cord length in the center. He’ll then taper the cord at the tip of the horizontal stab to give a nice tapered leading edge. Here’s his answer for supporting the new attachment point.

Excalibur rebuild project by Jason Mitchell. Excalibur Light Sport Aircraft building and modifications. Rotax 582 water cooled engine. Experimental Aircraft kits and construction. Home built aircraft, excalibur ultralights.