Embarrassing admission....Happy Number 38 guitar to me.

[jonwhitear]

Will the chrome metal control plate benefit from tape on its underside? I was thinking of just running a thin strip of foil around the lip of the cavity with a little tape on top and connecting down into the cavity. I would think that the chrome metal would act as an RF inhibitor....maybe it is copper etc that has the special ability?????

The control plate will act as a shield, as it's conductive. In theory, it will be grounded by the signal ground, i.e. the output jack ground is connected to the volume pot, which in turn is connected to the control plate through the pot's chassis. Having said that, I would run a strip of the copper tape over the lip of the control cavity so that it's in contact with the control plate. That might also be how you get continuity between the output jack ground and the rest of the shielding, if it isn't otherwise connected, though you're probably better off soldering a ground wire from the shielding to the volume pot chassis to ensure a good connection.