I already started my build two years ago, but here are some pictures.
I had before two WD 2TB (WD2000FYYZ) inside, but recently one of them died and I switched the RAID to two 4 TB Seagate NAS (ST4000VN000)
I'm running OpenMediaVault 2.x and a seperate Apache installation for OwnCloud 8.x.
The cube is sitting behind my cable provider modem and is accessible via URL.
Also I have connected the TV and running XBMC. When OpenMediaVault 3.x is out i'll switch to the newer Kodi builds.
The processor is a Celeron quad core. The complete package uses less than 100 W, but I did not measure the correct numbers.