The chassis/shell, mainboard, battery, keyboard, LCD, LCD power inverter, battery charger board, speakers, cables, heatsink, random plastic bits, touch pad are all custom design.
You can get a barebones setup (if you can call all that barebones) like that then go to the trouble of getting CPU, RAM, HDD, CDROM (might need a custom bezel), (NIC/Modem if it uses MiniPCI) then slap them in and hope it works.
In short, no you can not build your own laptop