Well good luck on the club thing, I know how stubborn local govt. can be with their red tape. Yep, I was having a lot of trouble trying to calculate the right volume because there aren't any sites that give a energy/volume breakdown, but 1/10 was sounds reasonable. 8)
About the HV secondary, I need a way to estimate how much current is passing from the probes so that a dangerous current cannot be delivered. Is it practical to do all this from the HV primary? My voltage there should not be much higher than 300v with the components I'm planning to use.