Wow, those questions are far too difficult for me to answer off the top of my head.
I can give you some references, though:
I would look in:
Prolegomena to Any Future Metaphysics
Critique of Practical Reason
These are they most directly relevant Kantian works on metaphysics and are probably your best shot.
I'm sorry I couldn't be more helpful. Good luck!
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The peculiar evil of silencing the expression of an opinion is, that it is robbing the human race; posterity as well as the existing generation; those who dissent from the opinion, still more than those who hold it. If the opinion is right, they are deprived of the opportunity of exchanging error for truth: if wrong, they lose, what is almost as great a benefit, the clearer perception and livelier impression of truth, produced by its collision with error. ~John Stuart Mill, On Liberty
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