I'm in the midst of implementing JH jimmy page design.
Everything is going fine. I noticed that the main 3 way switch is grounded and that the others are not. Is there a reason for this? Or does this mod take into account that we all have foil in our geetars to ground everything? If i do not have foil in my guitar should i go ahead and ground the switches like this?
Agreed - if there's no shielding or Gibson ground plate to ground the pots, your extra black wires will help a bit.
I do think that grounded cavity shielding would be helpful here though, more so than on a standard LP wiring. It will work without however.
Note that the new black wire going to S2, is almost the same connection as a green wire going to the adjacent switch lug top right of switch S2. You can save a wire by just connecting this already grounded lug to the switch case.