Great idea, thanks! Putting shelves in these closets is testing my limited carpentry skills. Almost everything curves and curves at different rates.
I created patterns made of cardboard for our front cabinet shelves. It took a lot of patience.
As far as I know, all interior walls are 1/8" thick. Plan to use screws with that depth in mind. When screwing into the light colored wall material like seen in my pic above, be sure to pre-drill to the screw inside thread diameter. This will prevent the wall material from fracturing and breaking out. You want the threads of the screws to bite in, but the center shaft of the screws must pass through or they will force your pre-drilled hole larger in a bad way.