Very interesting! They do look lovely!
The Wisbech and Upwell tramway had bogie coaches and 4 wheel coaches of a similar style as well, but yes they are a unique style of coach.
Haven't bought the model yet. I lucked out, there's a kit that really only needs a scratchbuilt grill to be correct.
They do, and contribute somewhat to my distaste for the kit. Looking at pictures, there is similar detail on the real thing, but this kit is greatly exaggerated.