While I agree that it is somewhat pathetic that students need plans to build these beds, that is somewhat off topic (althougth, like IRStuff, I got some wood and just "had at it" and got it done. Luckily, I quickly made friends with some upper classmen and was able to get the wood from the dumpster diving they had done when previous students had been moving out 3 months earlier.

)
I would disagree with cedarbluffranch's statement:
"Some universities actually require a PE stamp on the plans in order to show that it's not a homemade job."
Do you really think the university cares if it's a homemade job? I'm sure that in the history of the university they have seen more crazy and dangerous loft beds than I can imagine. And if a student is looking or uses plans to design the bed, do you think they are doing it because they want assurance of safety, or because it's easier? Maybe the university would like to supply a bed design to decrease the crazy and dangerous beds, but I think a design with some common sense would suffice. It wouldn't require a PE.
I think that the reason that some universities require a PE stamp is to limit the university's liability, by passing it on to the PE. That gives me some gut-feel for how much liability is involved (more than the university wants). Do you want that liability? And, if I am correct, and that is the university's motivation, then they will probably not be receptive to attempts to contractually limit your liability.
Whatever you decide to do, best of luck to you! I hope it works out for you. I didn't want this post to sound to much like "If you do this, you are wrong," though I suspect it might. I truly do wish you the best. I just wanted to throw my 2 cents in and give my gut feelings for consderation.
-- MechEng2005