I'm making 32"x48" glass-front doors for display cabinets. Esthetically, I'd like rails and stiles as narrow as possible, but am worried about the door sagging (pulled into a parallelogram shape) over time and eventually binding on the bottom of the case. Door frame is cherry, ~3/4" thick. I'm thinking of mortise and tenon, but am wondering if laminating out of 1/4" stock would produce stronger corner joints. Glass is likely 1/8", one large pane. Are there guidelines for min. rail/stile dimensions given door size? Diagonal stiffeners are not an option. Any advice or experience would be welcome, and thanks in advance.