I'm back in active development of one, as a matter of fact:

https://www.seventransistorlabs.com/Images/Induction1501.jpg

Let me know if you'd be interested in a kit or complete machine.  The control board should also be useful for TCs (though the maximum switching frequency is kind of low -- a TL494 at heart).

Tim

Quoted from: https://www.pupman.com/safety.htm

Quote

4.0) Ozone, NOx, and Vapors
A sparking tesla coil produces ozone, nitrogen-oxygen compounds, and probably a host of other potentially toxic substances. Do not operate a large coil in an enclosed area for long periods of time. Make sure ventilation is adequate at all times. There have been anecdotal references to people becoming ill due to ozone toxicity. The long term bioeffects are unknown.

Personal experience from operating Tesla coils indoor and breathing too much of a badly ventilated air results in a solid head ache.