Looking Great !
Rob and I have been going in generally the same direction with the dental chair concept.
He has opted for the (proven) Star Chair design with the Binoculars being supported by the back of the chair.
By chance and circumstances, I was able to procure a Optical Accessory Stand that was used to hold various instruments in front of your eyes for the ophthalmologist.
This is is a substantial ( 200 pound +) unit that is designed from the ground up to hold stuff steady in front of your eyes. Adjustable up down and all around with electro/hydraulics and pivot points.
So, I got lucky with this I guessed. I mounted my Oberwerk 45/100 on it and it was rock solid.
Every mount for telescope/bino is tested for "settle time" after it is bumped or moved.
Bino chairs have another thing to contend with and that is your heartbeat being transmitted thru the chair and ultimately shaking your view.
By removing the bino from the chair I hope to minimize (hopefully eliminate) possible heartbeat issues.
The chair and the mount on my design would rest on a rotating 1/2" steel plate
Thing is, you don't know how much of any particular design will work until it's built and up and running. And that's where Rob has an advantage........he is actually building something! I'm sure Rob will have all the kinks worked out and relaxing under the stars very soon.
Rob's design should work better than the Star Chair because the dental chair is many times heavier. Star Chair was designed to be light, quick disassembly and portable.
More power to you Rob, you are an inspiration.
Here is the archived CN link from the old days showing some of my thought processes.