Iintend to build a new car Pc. I alredy bougth the xenarc 7" LDC Touch screen.

My plan is to put the screen ove my dasch, with no cuts or bezels.
I do need some advice to what else do I need, Myintencion is to connect to internet using Win Xp, no much room for music because I alredy have an Ipod connect direct to my aux input, rear vior cam, maybe a easy to use gps and an interface that I could have just the comom information about my car performance over thescreen, like velociti, temperature, etc...

Thanks for your help