Check this wiring

[UncleBalsamic]

Can someone check if this diagram is correct.
It should be 2 volumes, bass, treble, tone. A series/parallel switch and a preamp bypass.



Thanks

[UncleBalsamic]

One question as well, can someone explain how I would ground this circuit, what wires need to be grounded and where the ground will be? Also, is the ground just a metal lug in the control cavity where all the grounded wires meet or does it have to be in a particular place?

Thanks