It's a bit hard to discribe so some photos are easier for me. If you look in the Model Airplane News plans section you can find a few pattern planes. I can't cut foam so I never bothered with the Curare but there is a very nice Atlas there.
I pulled out a paper template for the stab on one of my Daddy Rabbit builds and cut a rib. I was in a rush so I just used some photo mount spray to hold it onto the wood. A thin score with a blade or you can cut it out by hand if you like. I cut the rib out on the scroll saw then cut the notches for the spars then sand through half of the black outside line. When I have them all cut I use a piece of spar wood with sand paper glued onto it to get the finished size. It takes me a couple of hours to cut my own kits from plans. I order my wood in bulk from Lone Star Balsa and usually double the order so I end up with a lot of extra wood in my shop. My Daddy Rabbit cost me nothing because I had all the wood and hardware from builds in the past. By building from plans I also fly planes no one at the field has ever seen, I get a lot of those WHO BUILDS THAT questions from the guys, everyone seems to think the only planes today are ARFs.