I am finishing my stair trim in redoak and the 1x4's that hang down to accept the drop in ceiling are in oak also, I was going to buy 8 1x6's and cut the snug and miter both sidesafter I get 3/4 of the box builtI was going to wedge it in placenice and tight After I am satisfied. I was then thinking that maybe I could pre drill 4 bottom holesinto the concreteand countersink and run some tap cons into the 1x6's Then I was figuring ov covring Thanks again