Forward progress! They released an img for Ubuntu - Install Operating System - Seeed Wiki
It works and their instructions to install worked, ish. I haven’t played with it too much but immediately I found an issue with the networking. Only hardware eth0 and eth1 work. Eth2 and eth3 and wlan0 don’t show up in ‘ifconfig’ command so I haven’t been able to make wireless work. I’ve reached out to support to ask for some assistance.