Estes Super Orbital Transport Build, Kit #7314, Part 9, Glider Wing Dihedral Angle

GOTCHA: This was a pre-production kit, any mistakes in the instructions are taken care of before being available for sale.

The Glider Marking Guide was too wide.

It's a simple tube to mark, two lines on opposite sides of the BT-50 tube.

I'd recommend using 220 grit on a sanding block to get the correct sanded angle on both sides of the inside wing edge.

Mark with the side of a pencil, darkening up the flat edge. As you sand, you'll see the contrast between the penciled flat edge and the sanded lighter bare balsa. 

Sand and check, sand and check. You should be using a sanding block for this type of angled edge.

The two wing sides are glued together.

The picture shows a good fit between the two pieces. 

The cardstock "P" piece is underneath the right wing half.