The last bit invovled with installing the bridge is to route the body to accept the metal string plate. This requires a 11mm router bit (specially bought). Using a straight edge and two end stops I cut the channel. Due to the slightly awkward position of the controls on the router, the bit slipped a small bit as I was turning off the router (visible as a small dent on the bottom left).
The detailed instructions curiously do not mention grounding the bridge. However, on searching the net, the bridge designer has his own website which states the only possible grounding solution is to ground the back plate. I’ve drilled from the back route into the control cavity, through which I’ll put a ground wire and either solder it to the end block, or put some conductive tape in there for it to attach to.