Slotting yard sticks? Good luck and have allot of fun doing that chor . But as for balsa you get a blade that looks like a V fork that would go into the end of an exacto knife and use that for pin hinges or you can use an exacto blade to cut them for easy hinges . You can purchase a cheap no not a churp churp like a bird lol cheap center marker so you will be able to get the center of the wood to make the cuts. I still would say to atleast pin all of the outer hinges.