Re: Control electronics
Lee, one point I wish to stress is that barometric measurement, GPS and accelerometers are NOT mutually exclusive; having a GPS on board does not preclude taking inertial measurement too, and allow that to be periodically refreshed by GPS readings; and, when the ground is near, taking aerodynamic measurements.
One way to avoid or mitigate tube icing problems is to have multiple ram and static ports; say a ram air port on the nose and somewhere on the wing leading edge of each wing. If the ports are built into the plane they would be really quite light.