Check this thing out http://www.vintagebass.com/thedudepit/forumdisplay.php?f=31 I would probably guess this is something Michael built , man that is a whole lot of bass. From what i know of Michael's building style that is all hand cut, carved and assembled.
For all the posts you have Major Metal, I find it amusing that you missed the Hideous claw mega thread that all this stuff detailed in it.
and you didn't mention the word " Sadowsky " just teasing you, bro - i love ya! check out the briefcase amp.. the bass is bigger than the amp.