Stone tunnel mouth

One of my pet hates on layouts is the exit line into a tunnel to a rear FY with a fan of sidings in front, usually with some sort of mill or diary to disguise said FY. Tunnels start in cuttings, they don't stick out.
That said, last week Mrs. F dragged me kicking and screaming up to Caernarfon  on the Welsh Highland (the things I put up with for a quiet life). The last bit of the line from Dinas uses the old LNWR trackbed into the town. This was all a school day for me, so imagine my surprise when my unlikely model scenario slapped me straight in the face. I'm not awfully familiar with this route, but a check reveals that this end of line used to continue under the town and up to Bangor. Here we are then; sticky-out tunnel mouth hiding the storage yard with warehouse in front. All built from Wills sheet with low relief houses along the top. Prototype for everything.