Thanks, Ron. I cut the matching notch in the lower stretcher, so I'm committed now. 😀
I used the upper stretcher to get a visual of how the cable entry insert will look like with the access panel sitting on top. I may need a matching 1/8" thick lip on the lower edge of the access panel just for symmetry. I do need to keep in mind that nobody is going to look at the back (unless I point it out).