This was a great project for my little guy as he got to participate so very directly. I build things for him all the time but often that process is spaced out over several days. This was kind of nice because we started with all of the pieces and he simply got to put it together.
The kit was what you would expect from something like this. The pieces were all pre-sized, drilled and finished but didn't always match the pictures or directions. Nothing split or chipped during assembly so that was nice. I did have to pre-start some of the nails to prevent him from bending them over. I didn't like how the nail head sit proud of the wood unless you really sink them. I would advise doing that for your little carpenter as a few hard misses can really mar the finish.
You can find this kit here: