I've been promising for some time to post the pattern for the typewriter cover. After consulting with Mrs. Magic Margin she helped me make a set of instructions. Hopefully they make sense. If you have any questions please let me know and I'll forward the questions over to her.
If you happen to make one or have one made we would love to see the results. You can email your pictures to firstname.lastname@example.org. In case you haven't seen the examples we made I've included pictures below. The black and white one does not have any interfacing.