FCU, PDB and ESC's mount plate
I designed this to be modular and easy to remove as one assembly. Make sure you print this in ABS or Nylon, If you use Nylon it will be very flexible and easier to install and remove. the ESC's will melt PLA I am including the sketchup file for easy modification. If you make improvements please post the remix. These are the components I am using for this mount plate.
Mount the PDB with built in BEC first. Remove the heat shrink from the ESC's and snap into the holders. Solder all your leads to the PDB then install the FCU. Use two M3 6mm screws to secure the board to the bay for easy removal for upgrades and maintenance.
I have a google + forum called Robotic Drones that is for sharing ideas for drone technology.
version 2 update include longer posts, thinner FCU platform and mounting holes.
https://plus.google.com/u/0/communities/102454117185037731844
http://www.banggood.com/DYS-BL16A-Mini-16A-BLHeli-ESC-OPTO-2-4s-for-RC-Multicopter-p-975796.html