This project was easy to follow and to build! My only criticism is the "under $20" cost estimate was way off. If you're actually buying materials and using pressure treated lumber (which seems like an obvious choice), it ran more like $55ish (lumber, hardware, wood glue (ours was dried out and is something we normally have on hand). I think most people looking for a project would be wanting a total top cost and be happy to subtract what they may have on hand. We also happened to have some yoga-mat foam and a flannel backed vinyl tablecloth and staples/staple gun for upholstering the seats. I figured this was a more weather-proof option. Our little 3 have been on it non-stop! Definitely a win!