I'm building my first foam board plane too, N22NY. After reading everything I could from FT and others, I thought the 3M 77 glue method of making semi-permanent templates would work best and so far, no complaints. I had a full size print made at Staples for a few bucks, spray the back of the templates after you cut them out, and let them dry. The tacky surface that results can be laid on the foam, traced, and then removed for the next project without disturbing the board. Use wax paper between some sheets of your foam board supply for storage.
I've even thought of going to Michaels to get some heavy clear plastic sheet, so my scissors can follow nicely without biting the template, but I'll wait until I need to build TW Versa 2.0. Have a look at the minwax article, as well as the ExperimentalAirlines channel on YouTube for preservation ideas also, great info and entertaining to boot.