Fusion 360 shows flipped side in Yellow (ocher), correct side in Gray.
In Fusion 360, to Execute a command such as Combine, Join… the target faces must all be in the same direction.
So I need Gray all faces.
This is command to revers face.
After execute the command, the color of faces I selected for reversing changed from yellow to gray.
im thinking about take all surfaces and make a vector from two point, one from the surface and the other is the center of the whole shape
then take the normal for each surface ,
finally take the angel between them, im sure it will be clear to you to find which surfaces have flipping face