I seriously considered making a housing out of gutter, but with an 18" wide tank, I was concerned about light spread. I'll definitely consider it for a 12" wide tank! I've got a 30 and a 38 waiting in the wings to setup.
Well, I picked up some #2 pine boards last night from Menards (local home center). Going to put something together tonight with some pocket screws. Dug out some old Icecap 440s from the attic. I hope they still work.