The DS2246 is just a shelf of disks. The IOM controllers only provide an interface to hook a SAS cable to. For actual serving of data you need a FAS unit. Some people have installed SAS HBAs in regular servers and there may be support in /r/techsupport on Reddit, but obviously we don't discuss that here. I'm just acknowledging it is possible.
I would get a FAS unit if you want a home built NAS.