Partial update of the first prototype to achieve this:
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both key boards interchangeable with other keyboards
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controller board interchangeable with other keyboards
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also usable with a smaller controller board (nice!nano, ZMK) which uses a single ribbon cable instead of two separate ones
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controller board can be placed in left or right part (which adds three wires to the ribbon cable until you finally decide on left/right)
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add mounts for optional screws to lift the keyboard at its back
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shorter print time
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easier assembly and adjustment
The following pictures show the right half in its extreme setting for the case of "desk too high in relation to chair". It uses two screws without rubber feet because currently I don’t need this configuration.
Including a cirquepad (qmk supports it perfectly) and some rest for the thumb while using the pad:
With low profile switches:
See "rests"