Using Params in SITL

Hey guys. I am trying to simulate a QuadPlane. I am currently loading the parameter list from my QuadPlane and using it with SITL. But there are some errors and I don’t think its the right way to simulate your Plane.
I do get the plane spawned with the parameters from my QuadPlane but it doesn’t respond similar to the SITL one.
I wanted to know what is the best way to simulate in such a scenario, moreover, how accurate should I expect my simulation to be.
What all useful information can I extract from the Simulation.
I understand its a very open ended question but any help will be appreciated.
Thanks in advance.