I am not focusing on the next game case
*
now focusing on next game case
You scared me there for a second.

Just to clarify on the memory cards, are you going for an open space that would hold the card loose (like what SAG is doing with their cases)? I think you will have to do that since there were multiple types of memory cards in different sizes.
I also want to mention that when you design the clips that will hold the cart in place, keep in mind the different types of Everdrives that have SD card slots on the top (different locations for different versions). You wouldn't want a clip in the same spot as the SD card.
If your clips will hold it from the side, you probably won't have a problem (they will probably have to hold it from the side due to the curved top of an N64 cart). However, some Everdrive 64s also have a USB port off of the side, so you might have to take that into account as well.
Maybe I'm being too picky for something as unusual as an ED, but I'm just trying to get you to think about all possibilities.
