I hope your an electronics/computer engineer. Because that is not an easy task.
The ONLY way I've seen people build their own laptops is Asus makes some notebook "barebone" kits. But it already includes the motherboard, LCD, CD, floppy casing and keyboard and what not. All you do it add a hard drive, cpu, ram.
As far as tutorials... Umm if there were some then there would be more people making notebooks. Thats why Dell pays their engineers so much to deisgn such things.
And parts is a really tough thing, there are some notebooks that use regular desktop CPUs (but mostly junk ones). You might have some luck with larger distrubiers such as Ingram Micro, but you have to purchase usually very large quanitites to even order from them. Your going have to get some contacts in Japan or something so you can buy raw LCD modules. Plus manfucauter your own casing keyboard etc etc the list is very long.
Anyway my point is it's not like desktops where everything is modular and almost everything works in everything else.