Please consider that I am really messing with height here. I have no idea of the scale in the diagrams. That said, Diagon must be three to four story buildings so despite the buildings being as far apart as in Hogsmeade, by its very nature Diagon will have a darker more ominous feeling. So, I jigged the height back and forth and went with what I did. But that is a wide venue and not like the films. While it won't be cramped, it will be claustrophobic in its height, which it should be.