This was a concerted effort of the parents, grandparents and 3-year-old recipient-all of whom are very happy with the finished product!  This project took us 6 hours to construct and another few hours to finish the yard work and play yard chips.  Some of the wood pieces were not marked clearly with the numbers and we couldn't orient ourselves to how it was going together for a while-we could do the next one in much less time LOL!