I have the 1/6 SIG Cub on the bench. I am building 3. One is a Grasshopper (OS26fs), another converted to a PA-12(OS53fs) and the last converted to a J-4 Cub Coupe(OS40fs). Paul Matt drawings used to generate the needed fuse formers. I laminated tail feathers' outlines around a pattern instead of using enclosed kit parts. Good luck with your build! These are easy stick build kits that fly well!