Hello I am an Aerospace Engineer working in aircraft industry (Cessna, Boeing, etc). My professional work is in structural analysis and I also have a background in low Reynolds number aerodynamics. I'm interested in conducting research and development on < 250g quad. I believe current designs could benefit from aerodynamic improvements for greater flight time/payload/speed/etc. I would specifically like to make improvements to the DJI Mini Mavic or similar airframe. I have extensive experience in traditional RC fixed wing/helicopters but I'm completely new to quads.
1) Is it possible to tune the PID of the autopilot of a DJI copter if I were to change some of the airframe characteristics?
2) If I build a custom airframe and transplant the DJI electronics I may end up with the board that contains the accelerometers in a different orientation. Is it possible to remap the accelerometers of the DJI electronics?
3) Am I better off just buying electronic components intended for custom builds rather than trying to retune the DJI guts in a new airframe?
4) What are the best components (autopilot/esc/transmitter/receiver) that would be suitable for 250g airframe custom build?