Pile of dirt idea turns into hill with tunnel

For those of you who have read past posts you know I had a pile of dirt within Track 1.  I used it for a wee people scene.  Well last night I started thinking of what more to do with it.  So basically here is what transformed.  I know I need to work on erosion and beautification.  All ideas are welcome.

This is the original hill with some equipment to help me move it. 

While the wee people worked on moving the dirt I started on infrastructure.  Just pieces of brick I had no use for at this time.