Nice, I see you've gone with the Russian PIO caps.
I used these in my Yaqin MC100B to replace the cheap Chinese Dragon Coupling Caps.
They sound really nice in my amp.
I've been tempted to just buy one of those Douk 834P clones (MC) for a looksie but can't help but be skeptical as to what they have used as a SUT.
Anyway, looking forward to hearing your report on the finished item.
VPI Scout 1.1, Hana ML, Vanderveen MC10 SUT, WAD Phono3, Rpi3B+/Digione Signature, Xiang Sheng DAC-01, WAD KiT6550 and Reiver Edingdale SR