Well done with the nice and tidy looking construction! Several years back I built a Very Simple Phono Stage. I took my time doing it and am quite pleased with the results, but my construction looks no where as fabulous as yours.
I tweaked the power supply but it is basically a Juicy Music Tercel. Years ago I had an original Tercel and really liked it. It is very detailed with a touch of tubeness. Well I regretted selling it and when I wanted another, they were no longer in production. I contacted Mark Deneen of Juicy Music, and having seen some of my previous builds, he agreed to send me the schematic. The chassis is from China that I got off Ebay. I requested it come with no holes drilled, so I could customize it for my layout. Here is a picture before I did the tube cutouts. I used an Alps rotary on/off switch in place of what was originally designed for a volume pot.
Your build quality is absolutely stunning. Great job. Also those are some serious cans for a phone stage.