I would be very interested to collaborate with you on this. I am not very experienced in OpenCV, but a new team member that I am hoping will join soon will be much more on your "level" in that respect. More of my background is in windturbine development. Working on that we developed a cost effective way to rapidly produce, high strength, light weight, wind turbine blades using vacuum infusion and other methods. I also have a little experience working with 3d graphics, CAD, and FEA (just 2d magnetic modeling), though I would not consider myself an expert.
We are currently working on a tri-tilt rotor design. Nothing revolutionary in the design, just the way we are making it break down, and how we are dealing with the weight I feel may give us the edge. We are also going to be testing a DIY active gyroscopic stabilizer, along with other exotic vibration dampening methods if time permits. As far as the prop noise we plan on moving the props further away from the support beams, along with making the beams more aerodynamic so less pressure will build up above them. Also time permitting, I would like do design and build a custom set of props for our airframe.
I agree with the comment that this is not a military UAV site.
I have reservations about the managerial efficiency of anything overseen by DARPA.
I have serious doubts that Boeing or Lockheed or the big aero boys have practical experience building things with Reynolds Numbers under 100,000.
I like the idea that DARPA is opening the door to dialogue, but I think that it will turn out to be a Director type methodology posturing exercise, with very little practical connection. This is the golden age of RC, and I really respect the people who have designing and building for 30 years. I don't think that DARPA does.