Thanks for a great post. I have installed and it is working as advertised. I used an Ubuntu 16.04 server from linode.com and couldn't get it to work due to ffi 1.9.18 not working with ruby -v 2.3.x (can't remember exact version).
I upgraded to ruby 2.4 using rbenv and it worked like a charm. I used this as a guide:
https://gorails.com/setup/ubuntu/16.04
By the way a $5 VPS with 1 core and 1 GB of memory is plenty to run this from what I've seen so far.
may I know which VPS you use or recommend?