Jason,

Porkie has some very valid points there. I'ts too easy to look at these things with rose tinted glasses...........

In the cold light of day 16k would buy you one of the following cars that would be a much more practical road/occasional trackday car then a real RS200...let alone the kit/clone thing that you are thinking of buying:
RS500
Escort Cosworth
BMW M3 (3.2 evo)
Mitsubishi EVO6/6.5/7
Audi Quattro 20 Valve Turbo
Audi S4 2.7 Twin Turbo
Lotus Elise Sport 160 or 111S
BMW Mini Cooper S
Honda Civic Type R
Seat Leon 1.8 20V Cupra R
Lotus Carlton
Subaru RB5
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