I did make a carputer like ash, it worked but if you do it I would use an industrial pc board or some sort of purpose built portable computer system. GPS really didn't work well on the tv resolution clarion in dash lcd monitor I had. most elegant would probably be something like the alpine.
L.A.N.C.E.: Lifeform Assembled for Nocturnal Calculation and Exploration "What a beautiful life this would be; if I could just get it right" Vallejo