Right I figured Genesis, MS, Fami, and 32X could probably go into one case. My list is mainly in list of priority, but any that I can elegantly combine I will. EA carts I am unsure how that will work exactly, I am sure something can be done. Does anyone know how many EA games for Genesis were released?
DVD thickness may be possible for portables and TG16 with the thermal forming.
I just checked, and N64 cartridges are also very close to Gen/32x in size. The N64 cartridge is curved at the top, but the height and width is still nearly the same.
The EA carts for the Genesis are a different story. These are both noticeably thinner and taller than normal Genesis carts. I am not sure you will be able to put these in the same case as normal Genesis games. The number of EA games on the Genesis is not insignificant. A quick look at Wikipedia says they published about a hundred games on the Genesis, but I am not sure if all of those use their special carts.