Re: More what's this rigging questions
This is pretty much the same setup as on my boat. reef line attached to the pad eye on the other side of the boom, goes through the eye on the sail, down through the cheek block and to the cleat close to the gooseneck. Except I moved the end of the line off the pad eye and looped it around the boom instead as I was worried about the solidity of the eye.
You are just missing the second reef line which follows the same course as the first but through the second set of eye and block