Another wonderful model to look forward to.
The Trim Vane should have the arm connected to it to hold it out in the deployed mode. The piece between the engine hatch and left side light assembly. I know CAD isn't always dynamic. In my experience having the Trim Vane deployed for amphibious operations was exceptionally rare, it was most often used as a place to store gear since internally with a squad riding inside this "battle taxi" there wasn't much space.
'Nam style would also include rolls of constantina wire as well as chain link fence set up when dug in to stop RPG attacks.
Then gear. There has to be a plan for all the potential gear which was piled on this Track when it went to the field.
Again, looking forward to this kit.