Ok, just been doingsome shopping around for the components.
Do you remember what the voltage values of the electrolytic caps were? I've put down 35V ones as it should give a little bit of leeway with voltage spikes.
As for the MOSFET would one do?
And as for the Xenon bulb, could I use one out of an old disposable flash camera? Would a very small spark gap or a neon work? Any old xenon?