Wiring probs? Active wiring probs?

Take a peek at (wowwowwow.stewmac.com) and click on the side bar "Free Instruction Sheets" or something like that. There are a number of wiring sheets...

I've never heard of one. It may have been marketed in Europe but not the U.S. Is it worth dumping some brass into? Or, is it an experiment. You could scour the countryside looking for an exact...