I'm a software developer by occupation, but not done any mobile apps yet. Admittedly, climate control would be big first step! Rear camera should be straightforward, if it's USB camera and drivers exist on android. For the parking sensors, an i/o interface is needed but shouldn't be too difficult.

I was thinking about the sensors being displayed as a car with visuals of distances. The camera drivers are the main issue. There are a few compatible ones but not really for this purpose.

Camera, it would surprise me if there is not already a bumper mountable camera that's compatible with Android. It would be typically the kind of thing that would be all over the Shenzhen electronics markets!

Parking sensors with an app, definitely possible:
https://www.youtube.com/watch?v=stPc4zDBI1E
I'm actually interested myself in this. Summer projet for me perhaps :)

That does look good. Cost effective though?

Could have parked it by the time that took to load haha!
I'm hoping to retain most of the standard dash look bar the media screen in the dash on mine.
Whilst does look good in the middle I wanna try up top like newer cars have em.

Up top as in above the centre console?

Yup. I never use the centre two vents so could chop them out of the spare dash or mould a kind of add-on that could be removed.

The talk of rear cameras and such makes me want to do it more like that too.
That and some guages on the screen would suit me nicely.

Could you get a g force reading from the tablet via an accelerometer? That'd be cool!

I believe you can. The accelerometer is seen in the OBD menu.

And I too have a spare dash so could be tempted by the very same thing as an experiment.

Torque app has a g-ometer i'm sure.