I am laying out the legs now to accept the panels and rails
This is where the center stile will fit into the top and bottom rail.
The tenons are only 1/4” and the panels will float in the rails and stiles. The strength that holds the sides together will be from the rails, the top and bottom shelf which will be 3/8” X 1 1/4” tenons pined from the legs.
-- Bob Egbert AKA Sandhill