I have installed ROCK on a DE3815TYBE motherboard. I suppose strictly speaking it is a NUC but it is only a single core Atom processor. I have used a SATA DOM as the drive, 32 gig in size but it needn’t be anywhere near that big. It is only being used as an end point but because I haven’t signed on to it simply appears as a network attached device. It works well and sounds pretty good powered by a battery.
Ideally RoonBridge would be the better option but in this case the small and simple operating system makes it worthwhile.