yeah, the pcb is super super tiny and can mount in many places.
actually, you don't even have to mount it IF you only want a custom color. then set it, tuck it in, and close the gameboy back up.
but, the answer your question...
there are 5 tiny holes to drill (i'll be uploading more pics and a drill guide today).
the outer two holes are screw holes for mounting. the 3 inner ones are individual color adjustments.
they are all in a row, and the holes are the same size. easy to drill...
not switches, but trim pots.
actually, they are where a bit of the cost lies.
because the gameboys are generally dirty (..... filthy)....i switched to a sealed pot that won't let the dirt get in.. not only that, but Bourns, which make great stuff always (but, pricey).
i'll get more pics up when i can... i need to catch up on my other job today though since monday is tomorrow, then i'll get back to this...