Here's the Barber marketing copy:
"The Trifecta’s classic three fuzz circuits are based off of the triangle style pi sound, the Jumbo Bender style and the Suppa Bender style with our boutique mods/magic and superior build quality."
I had never looked at the Jumbo or Suppa schematics before, but after checking them out, it makes sense. The Muff, and those two "Bender" circuits have an awful lot in common.
Suppa Bender:

Jumbo Bender:

So yeah, it's a modded Big Muff, essentially. I'm not going to bother tracing it. Sounds good, though. Most Muffs do.
Gut shots attached. Transistors are 2N5088.