I am building a smasll 3 channel plane called "Old School." I'm using plans I bought from the AMA. My problem is that, I have always been thought to "Measure Twice, Cut Once," I layed my planes out on my workbench and started to trace the the outline of the bottom of the fuselage, two sides and the supports. Checked my traces from the planes, they were good. Cut the pieces from 1/16th balsa, Layed them out over the planes, all looked good. Now the problem. Once those parts were glued together, the rear was to small. No room for control rods to exit, and almost no room for the servos. Ok I made a mistake from where and I started over. This time I used a set of planes and cut the patterns out, glued to the balsa and started over checking as I go, everything seems right, but again same problem, to small. Getting very upset, about to use the plane a a fire starter for my grill.
Can anyone help me with this problem? I'm about to give up and just PNP planes.
Thanks for your time reading this, sorry it took so long, just wanted to make everything clear.

Mike Waddell