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I can't show pictures because my wife already packed the camera, but the intermediate results are stunning.

By switching direction between grits you make sure that all the coarser grit lines are...

I don't use circular motion. Until now I have always used a back and forth motion perpendicular to the edge (i.e. from edge to spine and back).
With my current project I am trying something...

Sorry for the late reaction.
You should be able to find up to 1K sandpaper in automotive shops where they sell stuff for repairing the exterior of your car.

As for the chromium oxide: I am not...

Keep going, you are doing good. I used the exact same technique when I did the razor that is showed here

Keep going until all the damage is gone. be sure to sand the blade evenly along its length...