While work continues on writing menus and working on my Arduino Mega-based prototyping setups (which are great little things in their own right - mayou design a case for them and keep them as is!) I have been looking at test-fitting the components into the GBA case.
As much as I'd like to just a the 16x2 screen via i2c the i2c backpack board makes it way deeper than what can fit in three relatively shallow space. One solution would be to remove the original battery compartment and mount a slimmer LiPo or Li-Ion battery instead of the normal batteries.
Another alternative would be to use the screen via spi, connected to the master arduino (leaning towards this being the Nano rather than the Pro Micro). But, by the time it is wired up would the loom of wires be any more space saving?
The plot thickens...