Hi TL, I'm sorry but I can't help you on this one as I didn't keep a record of the map I was looking at. I did e-mail Mostyn Estates asking for info on Cust's Path but they didn't even have the courtesy to reply to my request, no surprises there though.
There was an exhibition in Llandudno in 2011 by Llandudno and Colwyn Bay History Society and they had rare photos of Cust's Path so they may be able to help or you could try Mostyn Estates as they would have had the plans and perhaps you may have more luck with them than I did, good luck