if u mean a stealth cover for the actual drive so it appears to mot be there then just get the good ol' dbl sided tape out and smack some of that between the face place and the rom tray edge... *will require some filing/dremmeling of face plate clips first tho.
as in a flip down door? you mean something like this? its got just a port bay behind it at the moment but im thinking about putting a fan controller in there. nice and hidden...
@AngelofRage: I would like to know how to do that, unless you bought it which it kind of looks like but whatever. BTW, that flips up. I would think it would be easier to buy a cd-rom bay cover rather than make one. It isn't one of those things i would take pride in making either... "look at these |337 drive bay covers I made dude..." yeah it really just isn't impressive.