You need Hot Glue and lot's of it. Also, I've learned from experience that you can melt entire Glue Gun sticks into grooves for your PN64 handle grips.
you dont need 3 ground pins and you dont need 3 3.3v line pins all u need is 3 data lines just run one 3.3v line and one ground and then inside the box have them go to the controller ports. Then you have al0t more pins for other stuff
4 data lines, 3.3V, ground, L audio, R audio, video. 9 pins for that. VGA gives you some extras for s-video or running power through the same connector.
You need a ground, the shielding wont work. Toast and I know a bit about this from our port satndard (which we should probably work on) anyways mister hat, i just finished my box; wanna see?