If they fight over it force them to switch rooms every week. They will soon cease any hostilities because switching rooms every week is more trouble than they want
You can get rid of the black line at the top of the box by making the box as high as the wall. (Increase the canvas size, align the original at the bottom, export). You will probably have to that for each part separately considering the sloping walls.
By-the-way, I like the bed too! Good sound proofing.
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