Join Date: Jan 2016
Location: S. E. Louisiana
You mentioned you are building this in a case form. I'll assume the case has solid wood/MDF/Plywood sides you plan on using pocket screws to attach the shelf to. What about the back? Is it going to be enclosed in some type 1/4 inch plywood or is it simply going to be open where the wall can be seen behind it?
The reason I ask is, if the back of the case will have a plywood back, you can then glue a piece of wood to it that will offer support to the entire back edge of the shelf and then add a similar size piece of wood to the face of the shelf to strengthen it. That should make it much stronger and less likely to bend over time.