In case anyone else wants to try it. I have successfully installed Batocera32 on a Samsung Chromebox 300M. These have 2gb ram and an Intal Celeron with 16gb M2 drive for storage. I added a 128Gb via SDcard USB reader.
You have to do a little messing to unlock these but all the info can be found on MrChromeBox where you can get the new bios which enables the installation of a new OS. I had Cloudready running on it fine previously but it has been repurposed as an emulator.
Runs PSX upto about x3 resoltion and runs all Dreamcast that I have tested perfectly thus far.
I picked this up for just £23 and it has built it wifi (which works with Batocera), bluetooth and even a small speaker.
You need a Displayport to HDMI convertor or just display port lead, and audio works fine over hdmi.