Yeah, I am going to neaten it all up later, try and tape everything that's needed away neatly and make sure nothing is rattling around. If that's the case, I'll plug the GPS in at the same time then.
Initial impressions are good, though. Screen is nice and responsive, and once I'd grounded the handbrake wire, Android Auto setup was a breeze. The mounting bracket doesn't fit fantastically, but it might just need a little fettling.