There are 2 parts in your post.
The screen itself, may or may not. If the screen use RGB (which most likely), you can hack it to take RGB sgnal. If it use Video, it will works but suck.
The Touchscreen part, more likely will NOT work with carPC. If you can find who make the TS, what type of input it is and driver for the PC, it will work.
Most of us here are not that rich to have a 05 GS to test yet