One thing you are going to have to think about (aside from all the sliding mechanisms) is the leverage that those blades will have when they are extended.
If the bottom of the blade doesn't extend far enough back along your arm, there will be a very weak point where the bottom of the blade, connects to the contracption that hold them on your wrist. Of course, adding length to the blades means that when retracted they will go further up your arm, past your elbow. It also means that when extended, the force will be absorbed by your forearms rather than the contraption...
Just something to consider.
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