I made a Monkey Hut for my first burn last time I went.
It was real good...
But having to dispose of all this PVC does not seem to be eco-friendly at all :http://archive.greenpeace.org/toxics/ht ... /pvc3.html
(this is Greenpeace, they might exagerate a bit, but it's true that recycling PVC is a pain)
Using a few pounds of PVC pipes for only 3 weeks = 3 burns) seems quite bad
I'm not trying to talk you out of using a Monkey Hut, do what you want; but this year (if I get tickets) I will try to make a structure out of wood.
My 2 cents