New SFF DIY builder from Belgium !

Hello everybody!

To begin : Happy New Year for you and all your families, wish yours dreams come true. ?

I introduce myself : Thomas, 33 yo, a french guy expatriate in Belgium for 5 years.
I work in IT, as a Senior System Engineer, Infrastructure specialist (Hardware/Storage/Backup/Virtualization).

I come here because i have a (cool i think ?) personal project : build a DIY Home NAS with 2nd hand parts.
The build has started from this :
[Guide] NAS Killer 4.0 - fast, quiet, power efficient, and flexible - starting at $125

So, i have some issues about Hardware choices and power requirements, and I want to learn a lot from this forum
I am like in my profession, in life in general someone really curious and very passionate!

So thank you in advance for your welcome and nice to meet you. ?