Watt does not seem to be that type of guy. He seems to like to use off the shelf stuff, I think he does his basses Econo. No futzing around, just put it together with what you can get or find. Gibson in Toronto offered to build him a new bass, but that's not Watt's style, I guess. He did not take them up on the offer (Maybe he knew Gibson could not really do what he wants, at least quickly?) Look at how long the Shavo bass took!
I think he's like us a bit and wants to put together his own bass, himself, being part of the process.