First off, what a great plan and project. I just finished my last summer.

A few tips:
-leave the windows in for strength, it helps immensely
-reinforce the tail with 3/8 triangle stock between rudder and stabilizer
-build the low dihedral version (B)
-Be careful glueing the aileron throws on the trailing edge, specifically the metal rods the go through the 2 wooden triangulated balsa pieces with groves in them. Any glue in here will make the servos work extra hard.
-use threaded wires with plastic sleaves for the throttle and the front landing gear instead of the metal pushrods. this is a smoother and easier install plus it causes less servo load.
-make sure to install the servo tray and rails with their radio equiptment in after you've finished most of the model and ballanced it to the CG. Practice moving the tray around in the comparment to get the right balance so you don't have to add weight, don't be afraid to mount it more forward than the instructions say.
-use basswood or hardwood dowels for the rear pushrods

I may have a few more tips, personal msg me with questions.