Sorry mate but i just don't understand your approach to this.
1/. i note that you already seem to know the error on the
PCN and someone confirmed it.
2/. Your pics don't really show the bay for anyone to tell if it is compliant.
3/. You haven't shown the signs (or did I miss that), just measured them?
4/. When driving you don't need the CPZ map. Yes varying BB restrictions are a nuisance but you pass the zone entry sign and you pass the zone ends sign. Don't see your point.
5/. CPZ maps are only needed for your current investigations - to check the entry signs are present. Again it seems someone has told you this and given a source for the maps.
Just a tip cos I like to see all appeals succeed but if you ask for advice - follow it up.
Good luck.