I have seen lots of video to show how to make a raspberry pi into a retro game console. That's really awesome. I really want to have my own.
But most of them, the case is 3d printed, and the way to make that is too hard for the starter or normal user, so we made the Mido joy, plastic injection molded, two size of HD Screen with HDMI Port, USB Port Game pad, with 8000mAh big battery to run raspberry pi and the monitor.
Besides, you could put any version of raspberry pi in the back case, because the back case could changed by yourself to suit your needs.
My uncles factory made lots of raspberry pi case since 2013. most of that is in that is just a case. I just want to build this "super case" to make raspberry could be real portable in this way. Also, you could connect the keyboard and mouse to make the Mido Joy as a Mini PC.
if you also want a super retro handheld gaming case like me, please support us on Kickstarter. http://kck.st/2Hdx4zw