Hello Rune
You're right. There are jigs for wing and stab. Links how to build an Addiction, but I think it's similar than Good Shot.
http://f3a.lix.jp/radicon/manufactur...ion/index.html
http://www.starcraft.co.jp/index100.html
At the top of the pic jig is to put under ailerons. At the bottom of the pic jig is to put under the stab.
I never used jig I prefer to put a balsa rod under the ribs.