here are some pictures of a touch screen install that I did for my 03 Accord EX.
Lot of bondo work. Used a dash kit for car stereo and modified it to fit in a LCD touch screen.
Lot of wet and dry sanding.
First coat of sandable primer
After lot more sanding and priming and using a sponge to create a texture effect. Final result
As you can see, the buttons needs some work. But I think it came out pretty good.