The “rig on a board” is working well. I’m a little worried about it scratching the central console, so the next version should have a cloth surface there. I’ll probably use a thinner board with some carpet or corduroy covering it.
A wider board, maybe 10-12 inches, would leave plenty of room for the mic.
The wood for the prototype is 11/16 x 7 (measured), about 20 inches long, cut close to the middle. I used a regular door hinge. It has a little bit of play, but not too bad. A piano (continuous) hinge might be a better choice, especially if I use a wider board.
While I’m mounting things, an external speaker would help. I’ve plugged in one that I use with my Lowe HF-150 shortwave receiver and that improved the audio.
Hmm, 1/2 (or 5/8) x 12 (or 10) x 20 seems like a job for some scrap plywood. Just need to find some scrap carpet.