I have a lally column in my basement that I'm trimming up to match my bar. I have encased it in a plywood box.

Im going to add a stile and rail overlay to dress it all up.

I'd like to add some sort of removable shelf to it: but I can't seem to find brackets that I feel are suitable for the job (I don't want to see them when the shelf is removed)

I'm curious though if my solution will work:

im thinking of simply adding a 3/4" gap between the rails that the shelf will fit into. (Essentially the board I use as a shelf will slide into the 3/4" gap... When I don't want the shelf I'll slip in a 3/4" trim piece).


My concern is the gap shrinking and swelling with humidity change: and if it would be significant enough to consider this a terrible idea!