Hi.

I was thinking of building a ArduCopter based quad, but I realized that I have an unbuild HK 500CMT in my closet...

This is the order I placed at hobbyking about a year ago:

I also have an unused Futaba 10CG TX with an Futaba R6014HS RX. 2,4GHz.

I bougt on the above order a Futaba GY520 AVCS rate Gyro.

Batteries are two ABF 6S1P 22,2V 2200mAh. I might chose to have them in parralell to increase flight time.

I know that I need servos. I would rather buy expensive quality servos straight away, then using some half descent ones that I cannot have 100% faith in...

For autopilot, I was thinking of using:

APM 2.0 https://store.diydrones.com/APM_2_0_Kit_p/br-ardupilotmega-03.htm

Using an external GPS https://store.diydrones.com/MediaTek_MT3329_GPS_10Hz_Adapter_Basic_... mounted on the tail boom or other place to give a best possible gps signal.

C5883L - Triple Axis Magnetometer  mounted on the tail boom https://store.diydrones.com/HMC5883L_Triple_Axis_Magnetometer_p/br-... (Do I need this one due to the Invensense MPU-6000 sensor?)

MB1260 XL-MaxSonar-EZL0 High Performance Ultrasonic Range Finder https://store.diydrones.com/MB1260_XL_MaxSonar_EZL0_p/ac-0004-16.htm to help during landing and low level flight.

I would also like to be able to command the heli while it is flying. My understanding is that I need something like this:

Xbee Telemetry Kit https://store.diydrones.com/Xbee_Telemetry_kit_p/kt-telemetry-xbee.htm

This will take care of communication between a laptop and the heli, feeding new comands to the autopilot?

I would also like to add several cameras, but that is quite likely to happen at a later stage. I need to get this bird flying first :)

APM 2.0 have support for gimbal mounted cameras as I understand, and this is a feature I would like to use later on :)

Do I need to order a flybarless rotor head?

Any other parts that are required, or will help me greatly?

So far I am looking at around 300$, so that is no problem. I just want to make it work the first time around :)