This is for a full size bed. Everything you need to build it as well as the SketchUp file for you to modify as needed is here. The foot board side is a full ladder that will support adults with no problem. All of the slats are 2×4s with a small rabbet to fit in a sub rail. This creates a strong base for the mattress to sit in. Twin Over King Bunk Bed with Trundle, Bottom Bed Can Convertible into Twin, Full, King Size, Pull-Out Multi-Functional Bunk Bed Can for 4 People, Wooden Bunk Bed with Ladder and Safety Rail, Espresso 8 $45399 Get it Tue, Aug 9 - Mon, Aug 15 $149.00 shipping Max & Lily Bunk Bed, Twin-Over-Full Bed Frame For Kids, Blue 2,929 $65999.