This one is using a 3.2" SPI screen (using veteran gamers handy SPI adapter boards), this also means that I do not need a boost module, so everything is powered right from the battery using a TP4056 charger. I also have a barrel port installed in the original DC port for charging to keep the stock look and reduces mods to the case.
This one is using i2s audio. I have in game volume controls set up, because I find the volume wheel adds unwanted noise. I have one installed just to fill the port hole.
Also using and ADS1015, with hoolyhoo's script for battery monitoring, used a fork of his by sixteenbit, the only difference is the icon. They are white instead of green.
Using a common ground PCB (Helder`s OSH park boards), wired to the pi`s GPIO`s, the shoulder buttons are soft tactile buttons using a bracket designed by littleferris. they work great, and utilize DMG buttons.