I used your basic plans, but modified it to use some scrap wood I had from another project. I used blue stain pine, tongue and groove.
I made this toy box for my niece who is expecting her first baby (it's a boy). I know she likes things clean and uncluttered, so I added a lid, and then added some corner pieces to make it a little more juvenile.
It was so much fun.
I really only had to buy some hardware and rope, so it was minimal for me.