Very excited to see this here! My initial thoughts about the traced schematic: - R13 1k between U1A/U1B only functions as a RC filter with CB7 1u as presented. Simultaneously the signal impedance at U1B input (MFB) is determined entirely by U1A output impedance as there is no resistor present at U1...

Well that was fast lol. Glad you like it. Hopefully this doesn't end up on one of those PCB scalper sites any time soon. I got bills to pay... including the die for that custom enclosure. Sigh. Anyway, the trace looks reasonably accurate to me. The remaining caps can be easily discerned using an LCR...