Now go to the Front viewport. Select all the four cylinders and clone them by SHIFT + Dragging to the up so that the new cylinders are placed over the box.
Now select the box itself. Clone and place it to the roof position.
If necessarry, in the Left viewport, adjust the posion of the vertices of the Line02 which is the path for our Slide (Loft01). Play with the position of the vertices until you are happy.
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