If your missing anything, expect to have a horrible time with the set, or if your going to try to make it RC have the smallest of everything you possible can. Some things might be a bit flimsily built for kids, but it's probably a bit to hard for them anyways, it's an amazing set, but not worth the price point, but hey I still rated it 4/5 even with all of that, it's an amazingly cool set when finished.