Home‑made software md RAID 5 array from SATA drives:
Content from RAID5 disk array 
• dscf0002 

Dobrica Pavlinusic  posted a photo:
 
• dscf0001 

Dobrica Pavlinusic  posted a photo:
 
Final position in case, notice empty space above 4th disk which was occupied by disks before (which didn't have enough airflow because of that)
• dscf0012 

Dobrica Pavlinusic  posted a photo:
 
• dscf0007 

Dobrica Pavlinusic  posted a photo:
 
• dscf0006 

Dobrica Pavlinusic  posted a photo:
 
• dscf0005 

Dobrica Pavlinusic  posted a photo:

Note nice usage of construction metal stripes with holes which is usually used to hold fence. It has holes just the right size for screws to go through and hold disks nicely spaced (although a little bit more space would be ideal). It's soft enough to be bent at corners to produce nice and leveled space between it and case.
Blog post RAID5 for home  describes setup in some details.