SI-22BG/CI-22BG based dosimeter

The goal is to build a SI-22BG/CI-22BG based dosimeter with some type Arduino Due compatible output of 3.3v at any input/output pin on the “Due” board.

With the research done I've hypothesized that the circuit can be broken down into the following stages:

• high voltage
• gas detector SI-22BG/CI-22BG glass Geiger tube with anode or cathode resistance [both?]
• op amp based buffer positive feedback amplifier
• logic level shifter or equivalent for 3.3v signal

My current status is; well maybe this is common among beginner-hobbyist types as myself, but after the research that has been done, I'm confused now what is the right way to proceed. Since I have no high voltage experience, other than playing with some simple charge pumps and voltage doubler with a single AA battery: 400v with the possibility of a few watts of energy behind it is quite a leap.

I have knowledge of high voltage sure, yet no practical experience what so ever.

So then I ask this question:

In theory the Muller-tube is the key component to the dosimeter: so then would one set the conditions for proper function around the tube including proper resistance, [?] before deciding upon anything else?