From time to time, we get people asking for a website (or other source) for building plans or blueprints. Are these questions welcome on the site, even though the answers will almost certainly push the user away from this site?
I don't see anything wrong with questions that ask for help finding good resources on the Internet. It's akin to asking "What is the best library for X?" on Stack Overflow.
Such questions would probably be as specific as possible, and ask for plans for something in particular. The general question "What is the best website for plans?" is too general, and should be closed as "not a real question." It's also important to phrase the question so that it can be answered as objectively as possible.