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Bounding boxes around new buildings are used for better game performance. Collision detection is horribly CPU-intensive. During construction each element has its own collider, but this slows down the game. If this was kept for every new building, the game would slow down to a crawl.

Even with this trick, each new building is a burden, which is why there is a startup parameter that lets you reset them to their default state. I use this often, because I never go back to buildings I've finished anyway.

Same goes for off-limit areas: in these areas there is no collision detection on the ground, rocks and trees. Also, the devs didn't want to spend time finishing areas that aren't used in the game. I have written missions that let you go there, but you have to set solid items to act as a floor, otherwise you just fall down through the ground.

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