This 3D-Printed part makes it much easier to mount your power switch (as shown in part 2 of wermy's all-custom-and-aftermarket-part build guide: http://sudomod.com/game-boy-zero-custom-parts-guide-part-2 )
It can be used with the aftermarket switched used in the above guide, as well as the original DMG switch. You just glue it in place (with the wider edge facing the right), and glue your switch down between the two ridges! You don't need much glue at all this way, so it's much cleaner.
Be sure to watch the video guide to more clearly see how to install it!