Thanks for all the comments. Here is the tunnel system that runs below the ruins. Its a very tight tunnel (only a couple feet wide and tall) and at the end is a cave where the Meenlocks dwell when they aren't torturing unsuspecting passersby.

Meenlock Tunnels.JPG

Overall, I'm pretty happy with it (and finally came up with a method for making cave walls in CC3)...having said that, comments, criticisms, and suggestions are always welcome! (I've also included a version with both put together - so you can more easily see where the secret entrances to the tunnels are in the way station.)

Combined Map.jpg