DIY, triple bunk beds. Staggered beds make you feel less cramped when you're lying down. The system is easily adaptable to the width of your room. Here are the 3D plans in .skp format, made with SketchUp, which exists online in free version! (https://app.sketchup.com/app) or on iPad (https://apps.apple.com/fr/app/sketchup-viewer/id796352563).