…looking at images from the day I received the bike, I see now I've swapped sides with the petcock and regulator. However, I don't believe this matters providing I've plumbed it correct. I'll be checking all of this hopefully this coming weekend. Why did this happen, 100% because of the service manual, their illustration displays it as such.
As for your specific question docc about the two hoses, I'll have to give it a look when i get home from work today and report back.