Here's some pics of my portable SNES reader:
I was originally going to make the reader as small as possible but then I decided that I wanted a large display for my tired old eyes. The reader uses a RobotDyn MEGA 2560 PRO Embed connected to multiple Adafruit modules. The Adafruit parts are the 2.2" TFT LCD with microSD, the Si5351 Clock Generator, and the PowerBoost 1000C. The portable power is supplied by a LiPo battery that sits behind the LCD and controlled by the PowerBoost 1000C.
I've assembled an acrylic case for the reader but I need to modify it for a better fit. I'd also like to redesign the case from a simple box into something sleeker and more stylish. When I finalize the case, then I'll post some pics.