@thekong Thanks for your updates.
I have seen either double or single platform on Micro Seiki's. But for the double platforms, they tend to be the same non-suspension footers for both. With Verdier users, I have seen different suspension platforms used on plinth and motor. That seems quite counterintuitive, to say the least. But apparently, that's how it's done.
https://fosworld.wixsite.com/magna-audio/armboards-pods-plinths?lightbox=dataItem-kzb7w47a
https://fosworld.wixsite.com/magna-audio/armboards-pods-plinths?lightbox=dataItem-kkr568g8
Links above are to Steve's Magna Audio web-site in UK with beautiful ebony arm-boards.
Your idea of an arm-board that straddles both mounting holes for the Kuzma Airline will be the most stable way to mount a linear tracker on the deck. That would be an interesting project!
Regarding threads, I am using a viscose and pure silk threads from Japan. However, I have toyed with trying the K5 kevlar threads used on Micro Seiki's.
I have been following some of your past posts, especially your experiences with the legendary Rockports. Very impressive!