Well, after doing a bunch of reading and talking to Tom Webster, I decided to put my two comm andtennas between the outboard most two ribs on both the right and left hand sides of the fuselage right behind the cutouts for the aileron pushrods. I made a paper template to reference off when fabricating the aluminum doublers.

Here are the doubler blanks. It took a bit of calculating to get the dimensions right, especially the outboard end which will have a .065 joggle.

Doublers are bent and ready to be fitted to the fuselage.

Sorry for the blurry picture, but here's the right doubler in place in the fuselage.