I am a bit ashamed, and I thoght maybe I shouldn't post this. But you've all been a great help, and I think that I owe you to tell you how it went.
tl;dr; I've ordered a Synology DS918+ NAS.
Installing a RAID10 on my Suse machine was easy, yast was very user-friendly. But installing Samba proved to be much more difficult. Installing Samba itself was not too bad, and I could connect to my home directory. But making the NAS accesible turned out to be difficult. It may have had something to do with the fact that I installed the RAID as an addition to an existing Linux system, I did not reinstall Linux, which maybe would have made things easier. Anyhow, clearly I've done something wrong or I didn't know what I was doing. And even more clearly, my Linux knowledge leaves something (a lot) to be desired.
So, I realized it would take me a lot of time and a lot of trial-and-error to get all the components/services/applications I wanted working and easily accessible for me and my family. And I didn't want to spend that much time on it. (Heck, I missed yesterday's mountain track on Tour de France, trying to configure the system).
Besides, the Synology comes with a PACS server application, and as a former radiologist wannabe, I simply couldn't miss that opportunity (correct English?). What remains now is to get me an MR-machine. I can get one with a permanent magnet (so I won't need all that Helium) for as little as 100,000 USD (admittedly with limited use).
Trying to get this to work on Linux was absolutely worth it, and could have saved me quite a lot of moner. However, in the end I realized getting it to work as I wanted, would take more effort than I was willing to spend (correct English?).
Again, thank you all for great help in this.
pibbur who will be NASed again on Monday (probably).