Great project!

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!