If qcmu is no longer maintained, have you considered revisiting the original lispserver idea (http://www.cons.org/cmucl/doc/lispserver.html) and writing your own version of it?
The original article on cons.org plus the qcmu source in combination may provide enough information to get it done. This is a sensible thing to do, but it might be easier to find some free MUD out there, and use that to run the user-interaction part of the server, then just hook this MUD into LISP to run the back-end.
