Don't know if you've seen MineOS - it's made this method kinda obsolete. MineOS is extremely easy.
here's the thread:
Thanks. MineOS requires a newer Freenas Version than I am running (cant figure out why, but my server keeps crashing with 9.3 so i stick with the somewhat stable running 18.104.22.168.
I managed to get the jails working with many try and error attempts.
In the end I abandoned the scripts in this thread and just used screen via webgui shell to manually start the server.
Further I used cifs shares for the minecraft server files directory and so far its running great. I run 2 servers on the box, one is just for me and the other for a friend and me together (ftb infinity mod pack).
If i have ever the time to manage to figure out why 9.3 doesnt like my box i will give mineos a try. Appreciate the reply tho. Thanks and happy new year.