Not sure if these will work for you or not, but here are the pictures I took when I replaced my passenger rocker panel on my '69 Camaro.
Don't know if this helps you with the inside look of the outer rocker
You can see the inner brace that I had to cut out and install in the new rocker in this picture.
Getting all the old metal out of the front was a pain in the neck.
This is inside the car and shows you what I had to drill out to get the rocker and inner brace out.
The picture above and the one below is the inside brace on the rear of the rocker panel. I had to cut it out of the car and put it in the new rocker.
I thought I had one of the inside of the outer rocker with the brace welded in, but I can't seem to locate it on my website. Hopefully these help you out some.