I’ve decided to keep this thread running with progress pics for all who are interested, those that want to comment feel free. I was initially going with a single SpeakOn umbilical but have decided to go PowerCon therefore I’ll have two umbilicals as these only come in 3 pole. Here’s a new updated layout with the PowerCons in place.

Heres a pic of how my panel layouts are shaping up.

The case is a Par-Metal series 20, customised 12W X 16D X 4H with identical 5mm thick front panels on either end. I plan to use a local shop for all laser cutting and engraving, the base will also have the holes laser cut. My drilling skills suck, this is a lazy mans way out.
The psu will serve headphone and speaker duties for a balanced EHHA (in progress) and another long way down the track balanced β22, which I plan to do a little differently than my last build.