Okay. Quick update. I took the scratchplate off last night and had a look under the cover. Nothing on the preamp but it's all nicely installed - very tidy. Having a good close-up look at the top it's going to be an incredibly thin layer of flamed maple as when I look at the thing in profile where it's been scraped clean and you can see the indivdual laers you can't actually see the top at all - it may look like there's a deep top in the photo but the grain of the body almost goes up to the varnish. Must be paper-thin. Anyway. It's fine.
I took the action down a few notches as I prefer things a bit lower and it's very nice. Plays great. Sounds okay, you just have to back everything off a lot, so if the bass is 10%, mid centred at 50% and the treble at centred at 50% you get a really nice tone out of it. Whack the treble up and it gets very stingrayish indeed. A lot closer than a bass this cheap has any right to do.
The strings on it at the moment are perfectly serviceable - seem to be odd ones from different sets but that's fine as it sounds and plays perfectly well. I may keep an eye out for a set of cheap flats at some point and throw those on - could be a fun exercise but I really have no plans to do anything else to this bass as it's really just a beater.