Interface coming together in Photoshop. First attempt had lots of brushed stainless, and then I realized that the car's exterior texture would not be appropriate for the interior. Decided to keep it very simple in order to match the look of the existing gauges and warning lights, and so as not to clash or compete with the rest of the interior of the vehicle. Keeping a black background also means not getting overpowered by it at night. Google and nav buttons got scaled down considerably later. At this stage, I was throwing ideas onto the screen not knowing how I was going to actually make any of it work.