X Ray Transformer with Full Wave Rectifier Design
Amp Meter:

TL;DR Just put the meter in series with the HV on the high side or low side. Don't plan on holding it in any configuration.

I'm not sure how you expect you meter to measure anything in the setup given... Beyond that, your Amp meter seems like an over engineered setup. you should not need crazy resistors for it since the shunt voltage should be low, 100 Ohm in total on 100mA will only create 10V. You could consider using the meter like normal and putting it in series using the internal shunt? Regardless I would not plan on holding it, put it behind a plastic shield.

Volt Meter:

Seems fine.

My suggestions if you do this type of work more then once follow:


Get a Variac to put infront of your transformer, you then can adjust the 120VAC to whatever you need to make your existing 80kV transformer output a desired voltage. 500W ones are cheap, even amazon has them. Amazon Or right from the manufacture for high quality Variac
Consider buying an off the shelf high voltage supply, some companies make them specifically for driving x-ray tubes, or you can use a generic one like TDK's PHV series here. 
For resistors, you could use a pile of common large wattage ones strung together, or go to a company like Ohmite, and take a look at their high voltage catalog, they have a lot of options and distributors like Digikey do carry some of them. Ohmite HV


If you work with high voltage and need HV supplies, consider doing all 3 options above.







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