Well, that's what httpdito does: it serves files directly from the filesystem. That's why I mentioned it. But, for some applications, such as the website you're using right now, it's useful to display pages that haven't been previously stored in the filesystem.
Already an over kill.
Think smaller. Think simpler.
A single machine serving files directly from the file system (yes, from the SSD attached to the machine) will be able to handle a LOT more.