That is a beautiful copter. I just got my Bat Bone and am thinking of building one of these.
If your motors are spinning in the correct directions and your props are blowing down, check your ESC connections to the motors and the KK2.
Do this with the props off.
Disconnect all your ESCs from the KK2. Find the connector for the ESC for motor 1 (the top left motor as the copter faces away from you). Connect it to port 1 on the KK2 (the port on the top right of the KK2). Really, take the props off. Arm the board and give the motor power (not full power). Does motor 1 spin and is it spinning the right direction? Once you are satisfied that you have the ESC for motor 1, label its servo connector. Disconnect ESC 1 and connect ESC 2 on the pins for ESC 1. Arm the board and give it some throttle. Does motor 2 (top right of the copter) spin? Does it spin the right direction? Label its ESC at the servo connector.
Repeat this ONE ESC/MOTOR AT A TIME until you have labeled your ESCs and can connect them in the proper order to the KK2.
If these steps don't fix it, then we start looking at transmitter settings.
ESCs connected wrong caused me a whole day of frustration two weeks ago. It gets most of us at one time or another. Hang in there a bit longer.