Really nice work here! I came to this thread pretty late, but enjoyed looking at the whole thing.
Here's my favorite portal on my Mont Juic on my layout. Mountain is just Alpine meadow waiting for me to figure out what tree coverage I want. Procrastination is a good thing sometimes. Portals are scratch-built Masonite, mountain is plastic soaked Bountie on woven cardboard strips. I took the first picture tonight with a hand-held long lens on the Canon EOS. Could be better focus.
This one was shot earlier before all the plaster was painted and the water effects weren't in place.
Different view showing other two portals.