The shoulder buttons were placed higher than usual on this build because the customer wanted the option of putting the gameboy in his HyperBoy, the shoulder buttons above the battery bay would have prevented that.
Other things of note in this build, it's using a simple PCB with GPIO controls, as well as USB audio, with one speaker and a headphone jack. A TP4056 is used with a 3500mah battery (also a barrel jack is used to help keep a stock appearance). No boost module is needed since everything runs fine off the battery voltage. I am using an altered version of the Minty Pi image, in conjunction with an ADS1015 for battery monitoring as well. (I removed the combo script from the image, and used the minty battery monitor scrip only, i also needed to change the GPIO pins, since I wired to different ones that the minty pi default.)
I think that about says it all, check out some pictures now! This build is very similar to my 11th build in looks, and it was just coincidence that the buyer wanted a stock looking GBZ