How can define a parafoil Airframe

Hello every one
I want to control a parafoil that can only be controlled by two servo with the help of PX4.
Is there a source or guide for this?
I have seen in some sources that I have to use a mixer tool to do this.
But my question is that:

  • what Airframe is similar to my device?

  • And In general, how is the dynamics of the device considered in PX4?