Nice job, Scooby!
I think it's a great idea. The only problem is getting them to keep it looking good. You have to provide a little education along with the elbow grease.
I did my sister-in-law's car about a month ago, and I promised to do my niece's car as soon as the weather and time permits. Plus, the niece's is pretty rough looking, and will give me a good opportunity to use the new PC. I'm going to have to reorder some Z products though.
I'll try to get some before and after pics to post.