So there you have it. I'll get into more detail about the specifics of the schematic when I put together instructional materials. The one part of the circuit that has me a little concerned for inexperienced builders is the output switch, it's kind of a b**** to solder, but I think I'll be able to explain the method. I've thought about making an instructional video specifically for that task, which I think would help.
It's going to take some time, probably a few months, for me to put together all of the materials needed for an official DIY project release. I will be making some minor changes to the PCB for ease of DIY reasons (e.g., including test points). I will then have to build another one and take very deliberate photos along the way and compile them into a instructional PDF.
I know $1.5Kish ain't cheap, and this would be a big commitment to gather all the parts and build, but I really think people would be getting that custom / boutique amplifier sound for what I think is a pretty reasonable price. It's really very easy to build if you have all of the right parts / equipment. I would be very proud if people build and and love the sound, so hopefully that will be the case.