hmmm that's a puzzler, look again at this guys stuff,
http://www.thehauntedtrail.org/index9.html
he makes his walls with pallets, here's another place you've prob already seen
http://www.halloweenmonsterlist.info/
gotta be something cool on that monster page of stuff!
-Maybe a mine shaft, using a fogmachine with a spiral effect on a projector, have an extra I bought at a yardsale for $5 if ya want it.
http://www.gotfog.com/vortex1-1.html
One thing to consider if you do go lightorama, you'll have extension cords everywhere, having people walk on a boardwalk is the best way to keep em outa harms way.
You don't want a big lawsuit cause someone tripped.
I kept everyone out of everything, I had about 45 cords spewing outa my garage, and when we had my friend fire up a chainsaw on the bigger kids, I learned I had to stand between them and the graveyard as the tended to want to flee into the graveyard. Was a riot!