So the vertical bars need to be drilled for the radio racks?

Good morning, Duane!
Hope all is well with you.
Nice work on the new panel. You can expect to be hearing from me on this & several other things, too. Barron & I just bought a '77 M-5-235 that will be coming down to the bones in the next few weeks. We plan to update the airframe to current standards, add float fittings, and bring it back to life as an M-6 with a long wing.