Great! I hope they are laser cutting these kits now. You got the sequence; build the wing flat, cut it apart, glue it back together with dihedral. You are referring to the Guillow's SE5A and not the Sunbird, correct?
What sort of shape should leading and tail edges be sanded to? Rounded at the front and flat at the back?
Also, how do I tie the wire to the landing gear as you did? Tiny holes in the balsa and cotton with CA glue?