If you want to generate high voltages, there are several ways to do that without the need to cascade transformers:
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Use a voltage multiplier consisting of diodes and capacitors (plenty of circuits on the net).
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Use the magnatron's transformer from a microwave oven.
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Transformers from neon signs give out lots of Kv's
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Get a high voltage coil used for the spark plugs in older cars (still available from auto spares shops).
Which ever way you decide, a word of warning:
Messing about with high voltages ranges from dangerous to down right lethal depending on the available current.