I finally got round to routing out a cavity and channel for the pickup switch, and also filling in the old selector switch hole and drilling it out for another pot. It's not the cleanest routing as a lot of it was done by hand without any guides but also my new palm router wouldn't hold the router bit firmly and it kept coming loose, which didn't help as channels got deeper and shallower as I moved along them.
I've now decided to keep this one simple as I don't seem to have much luck with anything complicated at the moment, so it's going to be a nice simple white guitar with a black headstock and no flashy graphics.