I know there are several solutions around for protecting the Mac, but I believe what I'm looking for is easy to make for much less money, besides I can't stand all loud the advertising on those things
I have a carrying bag for my Powerbook, but I need something to protect between the screen/keyboard, and also a "pocket" for protecting against scratches.
So far I've used the polystyrene that came with my computer for the keyboard/screen, but that won't last forever:

However, I could use it as a template to cut out a new one from some sort of suitable material. What would be suitable material for this, and where could I buy it? I bet I need something
really soft which won't be the least abrasive. Would cotton be fine, or something else? I've heard people suggest micro-fiber, but knowing that it's actually a plastic material I can't see how that wouldn't be pure sandpaper abrasive in the lomng run.
Then, for the computer itself I would like to make a "pocket" to slide it in. Not so much to protect it against beating, but against scratches, so I suppose the same material as protecting the screen from the keyboard should do. Here's an example of what kind of "pocket" I want to make: (
radtech Sleevz)