Your schematic covers four different G100 models, plus there are still a number of others. What exact model do you have? G100? G100 II? G100 III? And 112, 212, 210, 115?
Of the two you presented, does one really match your amp? Note the upper on has the whole preamp on one board, whwile the lower one has the clean channel on a smaller separate board.
Yes, the circuits are VERY similar, but we need to be accurate.
The AB footswitch is just a common off/on stomp switch, wires need not be shielded. The reerb is also a common on/off stomp switch, but it is connected to the signal path, so it MUST be shielded wire.
TR101 has a pair of clipping diodes across its gate for distortion.