I saw that Kamp (@KampCreates) posted on Twitter/X about creating his own controller based on the Steam Deck's gamepad. He showed it off as a 3D model, and it would have all of the inputs that the Steam Deck has, including the back buttons, and would function largely the same. This model looks exactly like the one Kamp showed off and even already 3D printed and built.
"looks exactly like the one Kamp showed off" - does it? The shape is different, is it not?
https://x.com/KampCreates/status/1841614779472830946/photo/1