I am quite well aware of your ambition to spend your remaining years in four square feet with a bed, food, and litter-tray within reach, preferably with a self-maintaining sun-lit patch.
Us moving the litter tray into the bedroom is solely because of building work, not the first step towards your dream. Don't get your hopes up. It is going back.
And dragging the entire tray under the bed will not change this.
Mum (who is still wondering how you moved something that heavy and covered)