Okay, has been some time since I did some work for this part but I spent half day doing a lot of fixes based on the original Arduino mega board file. Basically, updated the header positioning on breadboard and pcb view and added the connector ids using Atom Editor which helped me a lot due to features like Find and replace using RegEx (and selecting all results with Alt + Enter), Sequential number package and beautifiers. The same stuff was used for all internal connection in BB view.
Here is the result: Arduino Mega Sensor Shield v2.0.fzpz (206.5 KB)
So far, the only thing left is renaming the pin in connector section and the big schematic view which I don’t want to do since there are like 325 pins! OMG!
The bad thing about internal connection with so many pins is that Fritzing can lag a bit while doing it manually.