A quick update on the project.  We are printing the ultrasonic mounts today and hope to have the servo mounts printed tomorrow.  A quick drawing of the proposed quad copter is below:

Below is our first draft proposal for the project

proposal first draft

First powerpoint presentation

The 3D models that we are printing

ultrasonic mount

Servo mount to tilt the sensors
corner mount for the rods

While these presentations and proposal draft have changed, they show some of the process we have gone through to get the project to where it is now.

Some of our previous test videos with the quad copter:
 (we will be updating this channel with the new videos)
youtube channel of test flights

coming soon videos:
3D printing parts
assembly
outdoor test flights
indoor test flights