I really love how the tent came out.
The chains do look a little odd - not badly rendered, more an unusual item to identify. So thanks for the note in the Edit.

The grid is my least favorite part ... not so much that I am opposed to grids, more that this one seems too heavy and distracts from the rest of the beautiful map.
I like that the tent is above the grid and wonder if the chains shouldn't be above the grid as well.