Request: Invisible Walls

[Honeydak]

I'd like to request a simple mod that removes the graphics for walls in cities. No modifiers on what walls do or anything, just remove the visuals. I love how organic and nice cities look without walls in them, and the fact that they're virtually impossible to defend without walls really sucks for that reason.
I would do this myself i had any clue how to, so if anyone with the know-how could do this for me, or at least instruct me on how to do it i'd be super grateful

 

[Honeydak]

Like is there a simple way i can just go edit this myself?