Thank you for your reply Oldgazer. It was a very constructive post! I have a few questions:
It would be ideally with the pixhawk mounted on top of the hexa, but as recommended of DJI (F550 flame wheel) and other builds, everyone mount their battery on top, because its the only place to fit it. Where would you mount the battery? On my rail below the hexa, i already have mounted a gimbal and a raspberry pi.
If i were to move the battery on the rail, and the raspberry pi and pixhawk on top, i would have to place the battery a bit behind CoG. I belive this is even worse, as for now it is at least mounted in the center.
How would you propose each layer should look like, cosidering i have 3 layers (top, between, rail), and a receiver (x8r), pixhawk, mauch power module, raspberry pi, gimbal (must be mounted on rail), battery and a GPS.?