Leonardo da Vinci lived almost exactly 100 years before the Blood Countess, so you may consider that, by the times of the Csachticz campaign setting, whatever secret machines he had created had spread all the way to the Fair Kingdom and the surrounding warring empires.
You may have a look at this blog entry here, and at my pictures below for inspiration.
|Glider (simpler design, with a rudder)|
|Mechanism to counter siege ladders|
|Ninja-Style Climbing Gear|
|Ninja-Style Water Walking Gear|