Figured it out.

I want a solid TE for the aileron and a solid LE of triangle stock. But I want a pretty solid, yet open structure in the middle.

I had some aileron stock here, but the taper was wrong and the cord was too short. So, I set up my little table top saw and ripped 3/4" of the trailing edge off the aileron stock. Kept that part. Tossed the leading edge back in the scrap box.

Next, I turned that TE piece sideways and bumped it against the saw blade every 4 inches to create a little cut out about 1/8" deep. My trusty Harbor Freight 4" table saw happens to have a blade width of just a snerch over 1/16". Next, I made a rib template out of 1/16" hard ply. It's 3/16 tall at the back where it will tab into the TE aileron piece that I ripped and notched. It's 3/8" tall at the LE, same as the thickness of the TE on my wing.

I cut out 7 more ribs from 1/16" hard ply. That gives me one on each end of both ailerons. Thats 4. And I want 2 side by side right in the middle of each aileron. I'll install the hard point for the control horn between the 2 center ply ribs. Thats 4 more - 2 per wing. And the rest of the little notches are for balsa ribs that I cut out of 1/16" balsa sheet.

I have notched the back side of the triangle stock yet. I will probably do that to help key the ribs into the LE of the ailerons.

I'll post real pics tomorrow after I get them built.