I disagree with both of those Tony
You won't get a VVT in there without either VERY small pots, extending the cavity, or drilling a side hole for the jack socket
Also a standard Precision pickguard will not need to be modified for 2 x stacked, assuming it fits correctly in the first place (@JR1000 don't make the mistake of assuming that all PBass pickguards will fit all PBass bodies)