The propulsion system is perhaps the most important factor on any ariel platform, I agree with the others. Keep the originals. Too important, liability too great, cost factor, not even a concern. Just waiting for DJI to release a stealthier low noise version.
We can only hope.
That is something many overlook. Carbon blocks radio waves. Doesn't matter if it is wifi or other.
Back when I built my own planes and multicopters, while it was awesome for lightness and stiffness to use CF parts, you had to plan the positioning of your antennas, use diversity receivers, to ensure you always got signal.