To be honest, I've had a go at following your guide and I'm up to about 4 failed and trashed attempts :)
Got the PBI version up and running (updated to 7.0.4 and SSL enabled) on the first attempt, but now running into some sync issues I wasn't having with the previous version I'd updated and broke!
My knowledge of FreeNAS, Webservers, PHP, etc. is pretty none existent and just don't have the time to learn at the minute so unless it's idiot proof I'm struggling.
Might have another go at building from scratch over Christmas as I should really understand a little more about how it works.