yamahatech

Hey guys tried searching through the tons of info on this plane and couldn't find my answer. My plane has been in storage for about two years and it got crushed. I ordered a new kit but I can't find the 4 s balsa template sheet for boxing in the tail section. I'm heading to the LHS to get some supplies and want to know the thickness of ply I need. I want to have everything ready when it arrives. If anyone has there's still can you let me know please, thanks.