Great-looking unit! I have one of your earlier builds of the B1 - I believe with the same phono board. Too bad that I haven't been able to make my Benz Micro Gullwing SLR sing with my Partridge 977 SUT - also one of yours, by the way. All the mm-stages that I have used with that combo has sounded off and strangely bland (EAR 802/Croft Riia R/Pass B1). Did you ever build a Pass B4 buffer, by the way?
I'm Peter, Denmark: AD Audio Satchmo 3 Line Stage + EAR 516 + Quad ESL 57 + EAR 324P + PTP6 Acoustand L75 + Poul Ladegaard tonearm/Denon 103D + Fidelity Research FR24 mk ii/Decca Maroon + Leak Stereofetic FM Tuner + B&O Beocord 6500 Cassette Deck + Synology DS 415+("upgraded" to 8gb memory) cabled to Win10 PC - JRiver - Paul Pang USB-splitter cable - Linear 5v psu - Nuforce U192s - Line Magnetic 502CA DAC