Wow Bucky,
You're right, Paul does look like Roger Waters (minus the potato chips and beer) LOL
The electric upright was one of the very first BSX. I tried playing arco on it but it sounded too electronic, plus any sort of heavy left hand vibrato and it would start wobbling at the end pin. I've got some more I've got to post as soon as I get them scanned.
Peace,
Dino