Quadcopter electronics stack mount (flight controller, power module, receiver)

This is my attempt to create a mounting bracket for electronics part of my quadcopter. Design goal was to hold flight controller, receiver and power module, and fit everything into the center of a small F330 frame.

There are three things:
- fc_base: lower part that holds the BEC power module and FrSky receiver. Mounted to the copter base plate (50mm mounting holes). I used additional nuts as spacers so that a battery strap fits under it.
- fc_mount: middle part that holds the flight controller (also adapts from 50mm to 30mm mounting holes)
- fc_cover: upper part that covers and fixates the flight controller

Here are links to the electronics parts I used:
- [NAZE32 F3 Flight Controller](http://www.banggood.com/Upgrade-NAZE32-F3-Flight-Controller-Acro-6-DOF-Deluxe-10-DOF-for-Multirotor-Racing-p-1010232.html?p=4P17132220124201508S)
- [FrSky X4R-SB Receiver](http://www.banggood.com/FrSky-X4R-SB-2_4G-316-Channel-ACCST-Telemetry-Receiver-Naked-p-1035549.html?p=4P17132220124201508S