I personally think that if you need this ASCII art, then your project structure is probably suboptimal. But I nonetheless submitted it because it is an interesting hack.

Interesting idea..

I have never used the minimap. I found it too small to be useful and it distracts me from the code I write. I navigate mostly by Cmd-R (on Mac, probably Ctrl-R on others). If the ascii-art wasn't that big in the real code, I'd think about it.

If you need ascii art to find your way around your code I think you're doing something wrong.