Just take a step back and read what you just said it almost sounds like "All I know is had that old man not appeared in the court as a witness for my murder case there would have been no drama and i would have been back home. Such judicial system".
I'm sorry but how do you manage to stay in the same room with something as ugly as that case ?
How many of those hdd retention thingy does it come with can you mount drives any other way without them ?
Finding a cheap cpu is not an issue you can get used i3 6100 for as low as 1.2k but there is no way you are going to find older mobo with 6sata ports for anything less than 10k.
The issue is cpus don't die that often mobos do and as the production stops for that specific chipset the price...
you could get a internal 2 port sas card off ebay for like 2-3k flash it mode and enjoy 8 sata ports.
I bought thsi LSI 9207-8i for my nas works great as long as you can keep it cool.
Be careful with no name sata expander cards if data is imp to you i have had bad experience with some of them...