I've been asked to build a two units like the ones pictured. The plan is to use 3/4 ply with 1.5 face frame with a rabbit for the ply leaving 3/16 edge,with 1/2 ply backing. First I can cut each shelf out of a 24x24 piece making each one whole(much more material used) or domino 12"rips mitered.
Second I'm concerned about sagging. We would prefer no support on the outside.
Looking for suggestions here