Remember where I said its an early prototype??
And actually he has a hole cut right where the bones in your butt would hit the surface.
Besides a simple seat cushion takes care of the padding nicely.
Im sure that the final production units would have a cushion of some sort built in.
And if as I have found with my own setup, any rests for my elbows or forearms only interfere with use.
By placing the controllers in a position where the angle between your forearm and upper arm is almost 90 degrees, youmake use of the controllers more comfy and easier to be precise.
Its also supposed to be better for your body as I understand,
Whats the word....?? "ergonimic"!