Do yourself a favour and learn about electronics then before starting to debate what is possible in electronics with people who design and build electronics.

'getting started in electronics' by forrest mims is not a bad starting point.

10kv can be perfectly safe and is in the same ballpark as the static charges you get from nylon sweaters.

Also, funny you should mention nuclear reactors, there was a teenager on TED who built a fusion reactor in his garage who may be going to work at CERN.