Step 1: What You Need
For tools you'll need (sorry but I forgot to take a picture)
something to cut the metal (I used a grinder with a metal cut off wheel)
A drill with bits equal to the size of the holes in you donor pad
and some small black binder clips
Step 2: Disassemble the Notebook
Step 3: Making the Covers
Once you've marked your covers cut them out of the sheet metal.
Now place the covers together on a clamp. File the edges to remove any large burrs and to make them uniform in shape and size.
Once they match take them out of the clamp and file some more, making sure to remove and burrs and sharp points. Run your fingers VERY GENTLY along the edge to make sure the edges are smooth. Be VERY CAREFUL doing this because you can very easily cut your self on a burr. Finish off with some sandpaper if you like.
Step 4: Making the Holes
Tape the 2 pieces of metal and the paper cover together (paper cover on top).
Use a center punch to mark the middle of each hole.
Drill out each hole.
After you've drill all the holes you will need separate the covers and deburr each hole with a file or grinder.
If you want to paint or do some other finish to the metal covers do it now before you reassemble the pad.
Step 5: Reassembly
You can take off the top 2 binder clips and line up the holes in the cover to the holes on the pad.
Then put the top 2 clips back on the then reposition the bottom clips so they hold the metal covers to the pad.
When screwing the spiral binding back on it will have a tendency to get stuck on the edges of the metal covers. Go slow and don't force it too hard or you will bend up the wire binder and that will make it even harder to get back together.
Don't forget to bend the end of the wire spiral back to prevent it from unscrewing.
Like I said you can scale this up to larger notebooks, but that obviously will involve a lot more drilling and filing. Also, once you've emptied the paper from the notepad you can simple buy a new note pad (make sure it's the same) and replace the paper covers with the ones you've already made.