Heres the box I made for my 4 Resonant engineering 8s... Its pretty nifty, I have 1" diameter electical tubing running from the front to the back of the box so you cant see any wiring.
Unfourtuantely after a few years of abuse one of the subs blew out on me and I cant find an RE dealer to sell me one... So the box has been sitting in my basement. I'll probably end up selling it sometime.