VERY impressive craftsmanship. Interesting concept. Have you considered NJM4556 that can be delivered in a SIP8 housing? It seems that with NJM4556, you only need 25% ICs.
How do you make your spouse accept such an "atelier"?
Nice build! I'd recommend getting a ADALM2000 for taking measurements, competitively priced with nice features (better than most of the cheap oscilloscopes).
