Hi Martin,

> that's why I can't grasp why I can't do vehicles.

Vehicles are a fundamentally more difficult shape to create - they are more towards the "organic" side of shaping with a lot of subtle variation in their shapes and not as fully defined just by 2D profile curves like other kinds of models.

They're kind of in a gray area in fact where you may be better off using tools that are more focused on organic character modeling to them like sub-d modeling tools.

- Michael