I'm not sure if the radiator will fit without some modifications to the supports. I believe what Bubba was suggesting was to use the temp sensor off of the SuperCoupe
You don't really want to put the fan on a switch, the amperage that they draw could easily weld a switch shut, you want to set up a relay system where the relay can withstand enough amperage to not have to worry about it.
There are universal kits at most auto parts stores that have a temp sensor that fits in between the fins of the radiator, I would recommend getting one of those. They are usually fairly cheap, maybe $20 or so, I'll check and get an exact price and such when I head into work today