Eh, I don't think fan-made content was ever considered to be quite so malicious as it's being considered in the days of copyright paranoia.
But honestly, why don't you just write up a nice long mail asking them if they wouldn't mind? Explain to them the scope of what you're going to do, that it's going to be non-commercial etc. Explain in detail why you're not going to cost them anything because of the nature of your game. I think it'd be a lot better to have an answer now than to put in all of that hard work into making the MUD and then getting shut down the next friday.
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