We are done! We worked on it Saturday and Sunday. I worked on the bottom 3 layers because my son got frustrated when the pieces keep moving. He is still young. Then both of us worked on the next 4 layers. It was exciting and fun when we can see the castle forming. Next day, Sunday, my son built the rest himself. He was very excited to finish it. My husband helped him at the end because there were some pieces missing and my son had put the wrong pieces in a few places.
Now, don't stop there! Let your imagination build other things... take a look around this forum (in the "Construcciones" sections, "Buildings"), and you will see some very nice things!