We loved the playhouse loft bed, but not the complexity or cost of materials. Then we found the camp loft bed with stairs. It was mostly 2x4 and 2x6 construction. We then cut out holes in plywood for door and windows then screwed it to the bed frame. The other deviation from the plan was making the stairs steeper we needed them to take less space. We just used 2x6 for the stringer and treads. the stairs are at a 30 degree angle instead of a 45. We also attached the rails using brackets from Rockler. This bed is super sturdy. Beware - it took us about 3 days from buying wood to painted completion. For the paint, we just used semi gloss latex, but my paint person recommended a paint additive called Floetrol to make the paint self leveling and prevent brush marks - it really does work well. Materials including wood, brackets, mattress and paint cost us around $500.