Wiring/Grounding question about "that metal thingy" inside the cavity.

I have an Axis. There is a piece of metal screwed to the wood inside the control cavity which looks like it is used as a ground connection.

This seems like a good idea that I could potentially use on my other guitars when I’m messing around changing components. My question is if anyone here can explain how it works/how it should be wired so that I don’t create a problem/loop. My guitars have typically employed the back of the volume pot as ground.

I’m in the process of completely rewiring a Pacifica with 1 volume 1 tone, HSS pickups.

Would this work?
– screw piece of metal to inside of control cavity
– attach ground wires from bridge, jack and both pots to the metal piece instead of to volume pot

If so, would I still have to bend the third “eye” back on the volume pot to create a ground there?
Also, does it matter what kind of metal I use for the ground?

Thanks.