Well I got this thing finished. I added the shelves and the back. I don't like the corner angle braces but I did not want to cut new ones. KISS. They should not interfere much. I went with the 3 10 inch and 3 15 inch spacing. Balsa wood in the top 3. Everything else down below. I will add a larger shelf topside for my 48 inch stock.

I did not add the plywood face frame as it would not look too good. I will leave it as is for now. Later I can add regular 1x lumber for the face frame is desired. Mini shelves in between the regular shelves may be added later.

This is should work well for my needs.