Just started my first scratch build foam board model. Bought plans for an Aeronca C-1 from eBay. Usually when you think of buying model airplane plans you think AMA Plans Service; a very comprehensive assortment. But I found many plans on eBay. Anyway, you get plans, make a copy, cut the drawings out, glue them to poster board to make templates, then trace onto foam board and cut the parts out. Then assemble the model. One way to glue the cutout plans is to use Elmer’s Disappearing Purple School Glue. It is in stick form, like Chapstick. it’s purple to let you see where you are putting it. In a short time the purple disappears. Just started using it but so far it works very well.