GUI Rough version
I am still not totally sure how you want the Main Menu. But here is a rough idea of what I have got. I didn't give any background or additional designs, just the structure. Here, on the left hand side, the car information will be showed. As this is an automotive UI, these buttons on left will get the most priority. On the right, there are the app tiles, based on consumer preferences and choices. Please leave a feedback if any change is needed, so that I can proceed to make it better.