There is no standard for motherboard form factors. There is also no standard on the LCD to VGA chipset interface and the list continues.
While I can give you the answer it only gives you a ready source of shells from Dell and others but where would you get parts to build it yourself?
I have a hunch you may think that laptops can be made much like we did desktops.
i want to fully create my own laptop, basically make it myself. is there any place i can find a laptop shell so i can add the parts myself?