This is an interesting topic for me since i am currently designing my new room. I had planned on building out some columns that would be wide enough and deep enought to recess the sub (ep350) inside. The columns would be drywall and studs with a stone (fake) facade on the outside for appearance. I was under the impression that as long as the sub was on the ground and the woofer facing outward I would get the proper sound. Seems i am wrong.
So you are recommending against this sort of thing? So much for making the wife happy..... She is thrilled that i am placing my fronts and centers behind the screen already so maybe she'll have to deal with this one!