I can’t say it’s impossible to mount pedals which require large force to it, I don’t know. But on the surface look, I am applying massive pressure to my brake and if the pedals are suspended on an arm which attaches back to the half dome of yawvr, then the arm is effectively a lever, so the forces at the mount would be mind boggling. I imagine the sort of force that would require steel and bolts or welds.
The buttkickers could be mounted on it but not in very natural ‘4 wheels’ position. Just a stereo buttkicker setup would work on it.