Although we can't imagine having a space large enough to encompass this kids' sleep/play house we were nonetheless enthralled with it last year. We were checking up on its creator, StudioMama, and found out that she now sells building plans for it - neat! (click through to see what else she's up to.)
Is repurposing wood pallets the new thing? (Ashley Ann's on board!). StudioMama (aka Nina Tolstrup) has been building furniture from pallets and selling the instructions. Eco-friendly for sure, but we expect these would need considerable sanding for use in a home with children.
You can find StudioMama's instructions for sale on her website (oh, instructions for the stool (top left) are free!).