If those are the definitive rules then it looks good, just the ID photos which may be an issue seeing as it's a mullet, formality I would think though.
Our local record rules have a clause for shore caught fish which states that a fish cannot be entered if caught from private land and not in an area open for the generl public such as marina pontoons or anywhere with "Keep out, no access" signs, i think the boat is the same if in a private marina not open to the sea sort of thing.
The second para could be a downer, but i think it's worth checking. He is very excited, bless him. Don't take away the fact that it was a teriffic fish though.