So, it arrived, here he is getting to know his new big brother
I have to admit that I'm ever so slightly in love with this mongrel of a bass. The tone is WAY better than I expected, quite mellow yet articulate albeit with a rather baked-in low level reverb, courtesy I'd guess of the aircraft hanger-like construction. The first thing I discovered is that if it gets cold it rattles, and when there are around 150 screws into the metal it can be quite an ask to find which of them is causing the problem. The big test of course is how it responds in a room with a drummer and a mic, I'll be reporting back.
One very happy owner, as the seller said, I now have custody, it's a responsibility I intend to take seriously 👍