Just got the Zenith back. All I can say is OMG. It's gorgeous. Simon at GUS has managed to fit a 22 fret 5 string neck to a 21 fret 4 string bass and you'd never know. The passive EMG's and greasebucket tone mod sound lush with a threeway switch and wired in series and parallel. The piezo only has a volume pot but it's got a hidden secret. Instead of being battery run it's powered by a capacitor that takes only 1 minute to charge and this will last 16 hours. I've put the original brass bridge logo on the headstock instead of where it should be. I'm my opinion it just looks better on the headstock (it looked good on the original rosewood bridge but now that has been made larger it looked out of proportion and 'wrong').
Anyway, I know I didn't do anything to convert it (unlike some of the skilled people on BC I would have just ruined something that, in my eyes, is probably one of the best looking basses I've ever laid eyes on), but I knew what I wanted and luckily had one of the finest luthiers on the planet just down the road from me who managed to transform my thoughts into a work of art