Filesystems, Disks and Memory

Can anyone guide me on how to build my own NAS ? I have an old laptop that I want to convert into a NAS, but not use the laptop as such as an NAS because it has some problems. I would like to build a NAS like the ones available in market.

I do not want to buy a NAS enclosure , but would like to build it myself.

thanks.

where is the problem? where do you need help?

I do not have a clue where to start. I searched a lot on the internet but couldn't find any references for this, except for the foll :

Amazon.com: "build your home data storage box! or NAS!"
Building your own Nas - vnunet.com
How to Build a NAS Device With an Old PC and FreeNAS - WinPlanet Windows Software Reviews

None of these give me any guidance as to how to build the enclosure itself i.e. in simple terms. I haven't assembled anything from scratch up, so any help in this regard would be great !

I need to know the following :
1. All the parts I would need
2. Any reference to how I would assemble all this

thanks.

you need the pc (board, cpu, ram and vga card... network if not onboard) and disks. also you need to choose which os you would like to use.