The hardware i was waiting for has arrived last week.
A battered old computer that was not top of the line when I purchaced it 6 years ago.
A basic desktop tower, with basic spin disk, and 2GB ram.
The next step is to decide what OS is going to run it.
The obvious option is Free NAS, and i will probably test it to be sure. But its requirements are a little over the top for this computer, so it might be better to use something thinner.
I will not use this computer for all the NAS functionality i can dream on - the first step is to make it network storage for the download files. And to make the files already downloaded available again in my network.