May I make a suggestion? Research whatever legalities you need to protect yourself and the consumer. I remember a hiccup a few years back where a CAP set (if memory serves, searched but couldn't find) broke where the arm connected to the bushings. Sound and appears you have plenty of skill and talent, but some type of liability insurance would be wise. If a failure causes Joe Consumer's car to wipe out another car, I am quite sure insurance companies will be looking for someone else to fit the bill.
