I figured it out with the help of someone at a local nursery. I bought some herbs yesterday and spoke with this person and had mentioned I was going to do the square foot method. He said he use to teach classes on it. So I gave him a call and he had the answer for me. I will stay consistent with the square foot sizing and then have a section on the side that is 8 inches by 12 inches. I will just plant smaller plants along the that side.

I measure out the center of the "short side", then plan my 12" from there. I have 4x8 foot beds and it just makes the corners 10 1/2" by 12". Not really much of a difference.

I put in 5 rows of corn at 8 inch intervals. While this is pushing the space requirements I slid in beans between the outer two rows of corn (sadly apparently my soil and beans are not working) and then pulled on corn every 6th plant in the 2nd and 4th rows and planned to plant yellow squash once the corn was about 15 to 18 inches. I was late with squash, and corn was about 24 inches tall when it finally got in ground. So far so good.

Bed is too wide at just over 5 foot wide, but was what I had when I got here. Hope to split the dirt into two 3 foot wide bed next year. Just need to gather enough cinder blocks to build new walls.