IMO this is more effort than its worth, and he will get annoyed with companies trying to hire him outright. You'd be surprised how hard it is for companies to change coding practices.
It very well could be, but part of the idea here is to make it as much of a "product" as it is a consulting gig. Having a clear scope and a document delivered at the end should help keep things clear-cut, and simple for both parties. In theory, at least.
