You can add location information to your Tweets, such as your city or precise location, from the web and via third-party applications. You always have the option to delete your Tweet location history. Learn more
I'll see about mocking something up later. Would you go with the orange rather than the grey for that color pop and easier writing/reading?
Yes. And I feel the switched colours from back to front give the card some extra dynamic in addition to the colour pop. I would also print out a bunch of different versions to see what feels "right" to your eyes.
Im afraid test prints wouldnt allow me to hold a finished product in hand before Gamescom x:
Doesn't have to be with the printer, print them out at home. Even a low-quality print gives a better impression of the finished card than having it on screen only.
Here's hope my printer cooperates. 
Twitter may be over capacity or experiencing a momentary hiccup. Try again or visit Twitter Status for more information.
