So I finally finished adapting a tablet mount for the spare din slot.
I've got a Bluetooth head unit which can be controlled remotely through both my phone and the tablet at the same time, allowing me to make and recieve calls whilst also doing anything I want on the tablet i.e. Mapping and listening to music.
The easiest way to explain it is that I got a air vent mount that suited a tablet and removed the vent mount section and instead drilled it into a shaped piece of timber that slots snugly into the spare din slot I have after I removed the original radio.
It works really well, with very little movement, great line of sight, doesn't get in the way of the gear shift, I still have full control of the radio and the air vents aren't blocked. I've also wired behind dash a 12v adapter for the tablet so I have tablety goodness all day and night (which is brilliant when, when combined with the keyboard dock (which also has a battery in it) I get a total of 16 hours battery life) and I have a portable battery pack that I can charge it with giving me a total of about 4 days before I need to plug it into the car/mains again.
Anyways feel free to ask questions! It was a really easy mod that only required a saw and a drill!