I've uploaded some quickly produced video on my Maverick Method of constructing multiple levels in 1 file. Done late into the night so I can hear myself fade to a whisper to ensure my wife doesn't spoil my foray into a media career for waking her up!
As well as MY YouTube channel itself I have also a side page here to list the video's available.
The Playlist for this series seems to mess the order up.
At the moment the sample file and lisp is only available by posting a comment here WITH your email (I will NOT publish and have not) and I will email to you. Perhaps soon I will post them somewhere that you can just grab them anonamously.