Not sure if this is even worth reporting as this mod hasnt seen updates in a while but I really like the petal hinge function, sadly it has an issue that even if the petals are open the parts inside the fairing still act as stowed and therefor can not be used, things like RCS thrusters or parachutes,
Pic for reference
I really like this idea and I would love to keep using it but sadly its impossible to do so with how the mod currently works, and since theres no mod or functionality in the game to override the "is stowed" mechanic on parts this design is unusable.
If I understand correctly vanilla cargo bays have a functionality to remove the "stowed" flag from parts when they are open, though this is just speculation, if something like this could be implemented for the petals that would be amazing.
Upon testing this seems to only affect vanilla aero, when using FAR petals work correctly, so I am assuming this will never get fixed / there is no interest in fixing it as all the other issues with stock area have been ignored.