Thanks Rev, and the sound clips will indeed follow as soon as I've had a bit of work done. Dave Gartland is not actually a luthier, he's a specialist aluminium-welding artificer who has gradually morphed into luthiery.
I'm genuinely impressed with the state that the bass has reached me in, but it has a pure rockabilly setup with a very high action (and an extra piezo under the end of the fingerboard) which doesn't really suit my totally pizza playing style.
It also has twin soundposts to stop the aluminium flexing too much, and I think these should be directly under the feet of the bridge. The treble side pretty much is in the right place, maybe 1cm adrift, but the bass side is at least 3cm too close to the treble side for my liking.
A brief verbal description would be that, played acoustically, it is reminiscent of a tuned steel drum. It's definitely a DB, and it's definitely musical, but you can absolutely hear that this bass is NOT made of wood!
Put it through any form of amplification of course (as I have done, though briefly) and the great majority of the metallic sound just disappears.
In a band situation it will sound like a DB but look like the DB From Another Planet. Since most audiences listen with their eyes, I expect them to be fooled into thinking that I can play like you guys!