So I am building some bookcases for my son and daughter-in-law. The lower units will have doors on them. The panels in the doors in question are made of maple and are 15 inches wide and 28 inches tall, the stiles and rails are 2 1/4 inches wide. A larger size than I would like but that’s the way they have to be. Anyway how much clearance do I need to allow around the panels to avoid problems with seasonal wood movement. This is in Minnesota so it is humid in the summer and forced air heat in the winter. Any advice would be appreciated