What is it you are making? Some things are easier than others with this approach. An afghan would be pretty easy, but a sweater (or anything else with any incs or decs for shaping) is a bit more complicated. You have to remember that row gauge will also be much different and that will effect any shaping. It may be able to be done successfully but it is kind of a matter of rewriting the pattern. I don't know of a site that helps with this. Maybe someone will though.