At this point it's all about the paintjob - I started by painting it with some white primer followed by three coats of pink:
Having done that, I started googling for different DIY pedal paint and that led me away from the solid pink, such that it currently looks like this:
. . . and with the knobs which I bought before I'd given the slightest thought to finishing (not the most sensible idea), which I may well end up changing at some point.
I'm currently thinking about whether to leave the pink at the top as it is or put more white on. Once that's done I'm going to put a few coats of satin clear on top and that should be that