Need some ideas on finishing an 7" gap i purposely left from floor to edge of rock for accessibility to steam return pipe in my basement project. My line of thought was to just nail 8" molding into the frame in case i had to get to the return pipe for some reason in the future (my idea was it's easier to just remove the molding rather than breaking through rock and have to repair). The problem now is, i can't find any molding that wide (I know should've checked before going through with plan). I attached a picture of the area in question. My current idea is to get 1x8 boards, rout the top edge and use my finishing nailer to nail it to the frame, but wanted to get a consensus from the pros.
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