Bitfenix Prodigy M, 4 bay hard drive expansion

The [Bitfenix Prodigy M](https://www.bitfenix.com/global/en/products/chassis/prodigy-m) case only supports 4 hard drives. As I am using this PC as my NAS server, I needed space for some additional hard drives. The adapters I designed allow the optical bay to hold two hard drives, and there is a clip-on bay that hangs below the optical bay that supports two more drives. Using these as well as the original mounts, this allows the case to support 8 total hard drives.