That's not homemade, friend--that's an NS Design NX-4 electric upright. It's aMAAAAzing. I wish I could post photos here. I also got an inexpensive composite French bow, as I originally learned to play arco. But mostly I wing it. It has phenomenal sound.
Because of that, I will restring my Fender Jazz bass, which presently has La Bella nylon tape-wound strings to give it a "woody" sound (and it does!), replacing them with Thomastik phosphor-bronze round-wound strings. This was at the indirect recommendation of Ms Carol Kaye herself. I look forward to hearing what THAT'S like!
Regards!
R.