Just from experience this type of client will end up whinging about your crappy job even though it was their idea. I did this a couple of times too starting out. Now if they say they want something done that i know will cause an issue I say no and tell them why. If they still insist after that then I guess I would walk. Remebre when they get a new guy they will say look what he did to our hedge. Your rep is worth keeping. Don't be swayed over your better judgement. I know that is hard but at least try not to do it.