Like a capsule hotel: A high ceiling (enough to sit up inside the thing) and good ventilation should be enough to fool your brain into thinking you're in a larg

Like a capsule hotel: A high ceiling (enough to sit up inside the thing) and good ventilation should be enough to fool your brain into thinking you're in a larger space than you are. Maybe even have a curved screen on top and have a picture of the stars (or anything you like).