Skysurfer;
The Drain Hose (45) which drains rain water getting into fresh-air (cowl) vent into engine compartment, and which would not cause leakage into passenger compartment, is shown here:
https://weblisher.textalk.se/gcp/20160201-027/ ...and I do not see the interior drain hose Derek speaks of shown, but I agree, that is likely the source of water in passenger compartment...have a closer look in that area.
Good Hunting!