I worked on finishing the left-side support and making the right-side support...and even getting the right side support nutplates installed. After installing and test fitting the right-side support, I am not sure if I will need both of them as just the one is really sturdy.
I am also contemplating attaching the avionics stack structure to the panel via button head screws instead of rivets. Still contemplating that one, it might be better for maintenance, but also might be overkill.