Thank you! That is a smart solution to inrease capacity!

When the diagonal is mounted snugly like here, the only way for the door to sag, would require the diagonal getting shorter. You are not going to push a solid piece of wood shorter like that. If the diagonal was the other way up, as is often seen, screws would be needed to try to keep it from pulling apart. However, that would not last.

I think he hit his head as well…