Hi @estephan,
Refer to the figures below.
The mesh “noDriver” has over 5000 illegal cells and that is the cause of your simulation problems. You need to fix the geometry and remove any intersections. Preferably, you also want to make the parts are a single piece rather than a combination of multiple pieces in order to reduce possible meshing problems and make assignment easier. For example the sidepod could be made into a single geometrical selection along with the main chassis.
Also note that your inflation layers are not appearing. After fixing the geometry problems you can refer to this document on how to generate those layers.
Cheers.
Regards,
Barry