Over the weekend I had some time to play with the anti-yaw mechanism. There is little guidance regarding this important piece of the 3DOF puzzle available on the internet. There indeed is a lot of force exerted on this mechanism so I am glad I sprung for the 3.5″ bore clevis mount. I am not sure that 3/4″ 5-ply floorboard is going to be strong enough (it wants to twist a little if I put some weight on it). Maybe putting another one on the back of the platform or replacing this one with plate metal would work (would have to get it machined).
Unfortunately this configuration doesn’t allow the platform to pitch down to the degree allowed by the actuators. Back to the drawing board!