Felix - I'm sure no one here has that level of detail.
Your best bet is to talk directly with Apple after signing up as an accessory vendor. Through this special program you can get some of this info if you can explain why you need it. I should also point out you need to have a product prototype and you can't alter the iPad case (per Apples standard disclosure form).
Otherwise your next best solution is to get a junker and tear it apart to make your measurements (or replacement part).