So i finished 3D printing the housing, my parts aren't here yet, but I cobbled together a High Voltage PSU and tested the detector. And it works just as expected: great :D

Just background radiation picked up by the crystal. It picks up somewhere around 30 events per second, my Geiger Counter picks one up every 5 seconds or so (A Gamma Scout w Alert). Goes to show how much more sensitive a scintilation counter is.

Didn't get the BNC's either, so i drilled a couple of holes in the back cap and ran the wires through.

And this is my workbench. The pink block is a Wima filter capacitor filtering the -1000V supply for the PMT