The modifications of the housing are all done by hand, as well as the hinges themselves are made manually. Only the center hole (not shown, 13mm long, 0.8mm diameter) required a table-mounted drill.
I recommend to back-up your S3 before attacking it with screwdriver, saw or file. The backup battery falls right off the mainboard, when you open the keyboard; the main battery cable is to short to allow removing mainboard or battery compartment seperatly. I moved them together and managed to keep the computer alive during the whole procedure.