Hi Matthew,
I can see that you were able to create the solids from the wrapping.
Great job here.
Now in order to create the simulation, a geometry is needed with these individual components.
One sild object for the chassis wings and suspension.
individual solids for each wheel.
So the Geometry will only consist of 5 solid objects.
Once this is created you can use this tutorial as a guide to set up your simulation.
Best regards
Sebastian