The first color handheld game system was the Lynx system from Atari.
My papercraft design for the original Lynx was pretty straightforward, except for the hand grips on the back. I had to use a bit of artistic license on them. Plus, it turns out that the cartridges were inserted inside one of the grips (I never actually owned a Lynx), so I had to create a cart port that resembles the Lynx as close as I could get it.
The Lynx II was a bit more design-intensive, just because I couldn’t quite get some of the folds to work properly. I ended up having the top and bottom pieces separate, which is a bit less aesthetically pleasing, but a lot more functional.
Here is a shot of my collection so far, to give a size perspective:
kescha66 