I think it could be done, especially if you could gather enough information to show people the likelihood of certain problems happening given their circumstances. The biggest problem is that without software to do the heavy lifting, you're spending so much time talking to the client that you might as well be their lawyer. And then even if you save them money, their "real" attorney might argue against your advice or retrace all your steps at an hourly rate.

I'm sure that there are lots of legal consulting companies that do this for people and entities that consume lots of legal services but the real trick is providing it profitably to "unsophisticated" people doing a one time thing.