Update: think I found a road!
The Preservation Zone map you have found undoubtedly has 2 yellow (what its legend calls "minor") "roads" crossing the narrowest part of the ridge.
The more westerly down to Hayfield coincides exactly with what is identified in the "Maroon Sites and Trails" map on page 24 of the Nomination File as the "Cuna Cuna Pass Trail" (in Blue) down to Hayfield. The more easterly is identified on the Nom File Map as being the "Corn Puss Gap Trail" (in Green) down to Bath. There is no argument that there are historic crossings of the mountain at both those points, but are the, what are called minor roads on the Zone map, "motorable" for the purposes of our "Connection"??Here is a description
of the "Corn Puss Gap" trail. And here a description
of the Cuna Cuna. Note the reference to "Both hikes" starting at Ambassadreth Cabins (Motorable to there - see my earlier post) . The Nom File map clearly shows the starting point south of the Parish border but clearly outside the Core Zone.
The Zone map may have them as "Yellow minor roads" but I do not think there is any evidence that they are motorable. This article
(page 10) describes the trails always in terms of them being "hiked"
Regarding the Blue Mountain Peak and whether it is inside the Core Zone or not.
The Preservation Zone map clearly has a black triangle inside the core zone marked "Blue Mountain Peak" - but I am not sure what the big black star to its West and possibly just outside the core zone is meant to be. I personally think that the triangle is too far in from the NP boundary to accurately be the Blue Mountain Peak.
The Maroon Trails map clearly states that Stoddarts trail (in Red) continues beyond the Core boundary to "TO BLUE MOUNTAIN PEAK, PAPINE, AND LIGUANEA"
Which is correct?
There seems no doubt that the core zone in this area runs NORTH of the NP boundary. But by how much??? Less certain (but probable?) is that the NP boundary follows the Parish boundaries. This map on "All Trails"
(may require log in but Google log in works) shows that Blue Mountain Peak lies just slightly to the north of the parish boundary. Google Satellite
shows the same - but with Google you cant rely on the location of "pins" added by users. I think, looking at the topography on the satellite view, its pin is a bit too far north. So - how much further north than the Parish boundary is the Core Zone boundary??? I really can't decide gien the information at the current time. For the moment do we rely on the Nom File Maroon Trails or the Preservation Zone map?? If you switch to "Satellite view" on the All Trails map it can clearly be seen that there is a "hut" structure at/very near the summit of Blue Mountain Peak (confirmed in reports) together with nearby areas cleared of trees. Was that "enough" for IUCN to run the Core Zone further north??.