After a fair amount of designing and redesigning, I decided to make my geiger counter look like an old-timey cathedral radio with a detachable wand to check various sundries for radiation. It was a bit more ambitious of a project than I realized at first but I think the results were well worth the effort.
Step 1: Materials
Nixie tubes, drivers, and power supply
-electronic components to build a power supply for said Geiger tube
-various electronics tools, such as a multimeter, alligator clips, soldering iron, etc.
-an oscilloscope is helpful
12 V wall wart/power supply
multiposition selection switch + knob
curly phone cable + 2 jacks
clear tube to use as a wand for the geiger tube
-router and router bit
Money for laser cutting
Step 2: Get the Nixie Tubes Going
Ogi Lumen has an arduino library written for controlling the tubes which you can download from their website. This makes testing your assembly easy enough and you can have some fun with the nixie tubes before you get everything else working too.