If the rear glass (window) moves when you open the vehicle, its a hatch.
If the rear glass (window) does not move when you open the back, then it is a trunk.
Other ways to define a trunk vehicle: With the rear seats in their upright position, a trunk vehicle has an area that is effectively sealed/divided off from the rest of the vehicle. The area behind those seats and below a rear "deck" or a somewhat solid piece just below the rear window, usually used for mounting rear speakers, this is the "trunk".
NO, you cannot build a wall in a Street vehicle. The height limit in a hatchback or other vehicle is the lowest part of the front windows. In a trunk vehicle the box must be IN THE TRUNK and you can build it as large or tall as you want, provided it remains in the trunk. The box would still have to be below the rear window and behind the rear seats in a trunk vehicle.
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