Hi Rena, Great to hear from you.
Don't worry about looking for old plans of Ferry Hill.
I have located where it is, by searching on Google Street Maps for Cork. It is now called "Ferry Lane" and other narrow streets nearby are also renamed as 'lanes'.
It runs from Dominick Street down to Pope's Quay and comes out at about 41 Popes Quay, just a few doors along from where the old Cork Button Co. Ltd used to be (who now appear to be trading further along the road).
One day when time permits and when you are in the area, I would love you to look and see what is there now at 7 Ferry Lane. No hurry at all, for that.
Thank you so much for the wonderful info you have sent to my email address today. I will be writing to you this
Writing soon, fond regards, Marjery