Building first plane......have a question.
LT-40, I haven't read the instructions.
GP's PT-40 and PT-60 have significant washout, and are quite similar aircraft.
If the way the instructions say to build the wing created washout.... I'll bet its intentional even if not clearly explained.
Build the second wing. If they match it will fly just fine. If they don't then you gotta figure out which one needs correcting.
I've built over 30 Sig kits... (probly over 50... lost count years ago.) never had one come up with washout that wasn't intentional.