To answer one of your first questions; yes, sometimes a young snake will starve themselves to death. Even for a tiny baby, if he has had some successful feedings, death is a long way off. Use a scale to keep track of his weight. Things start getting more serious when a snake starts to lose weight.
I have several snakes thriving in bins right next to bins with other snakes. If you feel that your snake is stressed by the amount of space, add more "clutter". Plants, plastic or real or extra hides. Little snakes love little boxes. Toothpaste tube boxes, toilet tissue tubes flattened, cut in half or one end pinched closed. If the neighbor snake seems overly interested make a visual barrier. This can be as simple as paper over one bin side between them.
Good luck.