You used a u-bass neck for that?
No, now that GBassNorth broke the ice and admitted these basses are ukuleles, (not to mention that Kala is a ukulele company), I can reveal that it's the neck and bridge of a tenor ukulele that a local luthier grafted onto a wine box I had lying around.
It's a novelty, unlike the serious musical instrument you play that just happens to look like a ukulele.
It's a piccolo bass, because I would never thread-jack a bass forum with ukulele content.
