I think that is what he was asking, when we were discussing cases elsewhere the other day.
He mentioned a 'top section add on' so that I can find a custom watercooling loop in the C4, so that would suggest a Top Hat type addon.
So, as expected, it's not a Dan Case solution. I couldn't see you working that way, having seen your previous designs and thought process.
The Ghost is a nice case, but 'messy' IMHO, as it's cleverly trying to be 'all things to all men'. What I like about your designs, is that they are carefully thought through to offer a specific SFF solution without being too niche or limited.
Silver C4??