This can be done in amapi too. and quite easy too. You can try to make the basic shape with cilinders and cubes and then add rounded corners with the help of cilinders, spheres and tori, but it takes some practice to find out how. The more often you use booleans the easier it gets to find out how to build new shapes. But I have to say that making these objects completely with booleans takes an experienced boolean modeller. terrains might be easier, but you have to know how to make them properly.

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