*thanks to Ballblazer for the addition of the console diagrams!*
Figure this may be of interest to some and while I couldn't find the main 5200 console design itself, I did find the controllers and game carts - which I must add are probably one of my favorite carts ever designed/made. Really love the look of the 5200 carts, just a shame the console failed the way it did because the system itself is great.
Regan Cheng designed the 5200 Carts:
and Roy Nishi created the 5200's joystick that everyone dislikes so much. It's cool from a design standpoint just performs poorly from a functionality standpoint which is one of the form over function cases regarding design.