Nitrogen Laser Power Supply (ignition coil)

[Dunce]

How's it goin, I am trying to design up a high voltage power supply for a nitrogen laser using the circuit used in James G Smalls laser. I have to get a car ignition coil and modify it. I was just wondering, Is there anyone who has done this before? I was wondering how to got about the modification, what current will be going through it, and what type of ignition coil would suit.
Your help would be greatly appreciated.

Cheers,
Dunce