I did not like that BIG DIY project..
To big, to much noise and the flow of mist was not so focused !
To make the perfect mist-wall, you need to make a laminar flow of mist.
I did a small test here : http://www.youtube.com/watch?v=5-Tgh_33Skg
But it was a test done in 10 minutes :P
I soon receive my 9 head mist-maker.. then I will try to make a bigger one
But if you have allot of mist-makers, and you make a laminar flow with some fans, you can make a decent fog-wall screen i think..
(btw, it have been discussed before at PL )