Don't do it unless it's for fun and you have plenty of time.
You might be happier with a modern quiet case. I just replaced a server/storage computer and used a Fractal Design R5, which was a big improvement from my last build 10 years ago (Corsair 650D). Also power supplies are quieter. Many don't run the fan under low loads. Disk density is higher, but disks are not quieter. All this can add up to lots of time (depending on your experience level) and money.
I went with a "solution" that didn't require me to learn new stuff. So linux, raid 6, LMS (squeeze server), Roon, Subsonic, and NFS (to share with Kodi etc). (What I've read suggests software raid, and that's what I've always used.)
As for HTPC/video, Kodi running on an Amazon Fire is nice if you have local files.
Although I do it, it's hard not to argue that storage is for suckers. You'll still need backup (probably), and one day you'll have to replace it.
PS. If you're doing it for fun, go all the way and learn linux. Things work and there are plenty of resources.