I installed a Classic Auto Air
http://www.classicautoair.com/Custom.asp in my homebuilt and it was a cinch. I used the electric system as shown on the site above. No cables to run- it is servo operated. I have the controls in the glovebox. My car has no top and the a/c is great. Really helps on those hot days at traffic lights and you can still feel it while driving. My wife would NOT enjoy the car without it. (which makes it more enjoyable for me ;>)