In the NavMesh video, I noticed that the NavMesh was also on the top exterior of the ship. Eventually, will NPCs be able to climb on a ship for repairs, etc., or why was it there?

Yeah, it was for that reason. Basically, it's up to the designer if they want to have it external or all internal. But in general, this is what I set up with the other designers here as an example, because it's really important that the AI is able to move anywhere the player can. So the spaceships have some exits that allow you to go on top, so this is what the AI should also be able to do. But for repairing, or imagine there is a mission in which they need to... they should be able to still be attached to the spaceship and move around. So this is why it's there, to give this knowledge to the AI in the future.