Anything from ArduPlane v2.69 HIL and up seems to not want to work correctly. When connecting to MP 1.2.50 with v2.69 - v2.73 HIL firmwares (APM 2.0 board), MP doesn't see the RC controller and there's no way to config the "Radio Calibration" feature
Will the default PIDs for the Quad work for the Hexa using the purple motors and 10" props? Or will some tuning be involved because of the frame change and two extra motors?