My first DIY totally fanless Roon Music Server

Hmm - that barebone PC you mention is a Celeron-based device. That’s below the minimum spec that Roon Labs recommend for a Roon Core (Intel i3). If you’re going to install ROCK on a device, then you won’t be able to install fidelizer, JPLAY or Asset UPnP - ROCK is a turnkey OS designed to make an appliance. It’s rather like saying I’m going to install fidelizer on my CD player…