One suggestion on shelving, make the shelves for bullet storage narrower as bullets tend to be heavy. That way they won't bow in the middle. Shelves for dies and powder can be wider between supports as they tend to be bulkier in relation to their weight. I would make the cleaning bench a comfortable height to stand at and the loading bench a comfortable sitting level unless you have a decent bar stool with a back in which case you can make it higher as well.