Building simple areas can seem very straight forward, however, once you have simple objects, and rooms, often you feel inspired to make something that bit more special, or enhance the area with new commands. My advice for more enhanced building is MPI, you do not need to know it inside out, but having a hand on the references is always a good idea. It is technically possible to make all the muck commands out of MPI, but MUF is generally easier for commands such as @stats.
This section goes through a number of advanced ideas all built around making an opening/shutting door (there is a program to already do this on Camelot, however, this covers many of the aspects needed for more advanced building concepts. If you can think of something you want covered which you don't feel I have covered here, please let me know.