I've played the B5R a few times. I have a late 80's SVT-II. I haven't played through any Kustom stuff. I'm curious about it.
Been playing the Genz-Benz stuff the last year. I have a Neo 2X12 cab. I was using their NeoPak 3.5 head, but I got the newer Shuttle head now. It's even lighter than the NeoPak and twice the power. . It's crazy. I'm thinking of getting the 1200 head that I think you were playing through in that photo. That's why I was curious to see what you thought of it. It's been years since I've been excited about amps until I started playing this stuff.
As for the flats.. I'm not too hip on them, but I'm always surprised when I find out who plays them. I have a feeling one day, I'm going to get hip to them. Thanks for taking the time to share the photos and rig info!