Re: How to use the knife-function in 2D-Polygons
I think Andy's original suggestion was to create the 3x7 mesh and skip the knife altogether. This is probably the best approach for what you're trying to do (the knife isn't built to cut out interiors, only make slices along edges).
The idea is, you would remove the surfaces you didn't need from the 3x7 mesh. You could then resize each of the rectangular holes by manipulating the vertices directly.
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