OK, I've glued and screwed some plywood (3 layers of 1.5mm ply araldited together) to replace the wood over the bridge screws to make sure they'll be able to grip properly. I don;t want the bridge flying off at a bad moment.

The battery box is a two battery one and thankfully the screwline only overlaps one of the battery holders. I've hacked and filed a lot of plastic off the base of that side of the battery box and it just fits while still allowing both battery compartments to open.

I'll probably have to grind just under a mm off the tip of the affected neck screws but that won;t be a problem.

So - I think I have fixed the effects of my stupidity!