The whole system has a lot to recommend it, especially the newest version with an electronic control set up and an electric water valve, but is costs a lot and for that much money there should not be that many times when you go to install something and say, "well THAT's not going to work". Watching threads about their products here, I also have seen various folks try to work with Classic to fix what's wrong and Classic seriously seems to have NO interest in fixing the problems. That was certainly my experience.
Let me give you a few things as examples:
If you use the adapter for the defrost ducts that they send you the outlet is right in the middle of the slide control that they had you install on the dash controls.
They have a great electric water valve, that they think you should mount in a heater hose and let flop around above the exhaust, rather that supplying a bracket to hold it on place.
You have to modify one of the slide control so that it will work properly.
As far as the double belt situation, they sell you a double pulley compressor and insist that you use a double pulley alternator, and then sell brackets in which the grooves don't line up with each other or the double groove crank pulley that they insist that you use...
As you say, hot rodding with after market parts can be a challenge and require skills to fabricate solutions, but when you market a "Perfect Fit Kit", it should at least be close, and buyers should be aware of the skills that they need to make the kit work.
