First I want to say that if you like Lego’s and are thinking about buying this set, do it – the end result is a fantastic model. The reviews that say it does not go together properly or that the instructions are not correct in spots are just plain wrong. I do not know the background of everyone building one of these, but if the instructions are followed EXACTLY as shown in the drawings it will go together and produce a very nice, sturdy model. No glue is needed to hold anything together as some have suggested, and the parts fit tight like all Legos do. While I’m sure that even Lego from time to time can miss a piece on a set this complex, which I am sure is frustrating, the set I received had no missing pieces.The set comes in 12 bags plus a great instruction manual that has some nice history of the Saturn V. I want to stress that if you are not familiar with Lego instructions or used to building complex structures please try to familiarize yourself with the steps and how they progress throughout the build. A couple of things to keep in mind when building this or any Lego set:1) Build on a hard surface such as a dining room table or counter top. This will help stabilize the model as it gets taller, especially when putting together the sections on step 37. Another very important thing about building on a hard surface is it allows you to seat all of the pieces completely before moving on to the next step. I do not hold the parts in my hands generally to put them together, I rest all the parts on the table and press them COMPLETELY TOGETHER AFTER EVERY STEP before moving on. Not only does that make the connections as tight as they can be, it also helps to line things up when joining sections together down the road. It might not seem like much, but a tenth of a mm here and a tenth of a mm there adds up quickly when you start stacking subassemblies together. I believe that is where a lot of people are encountering issues with parts not lining up. I think this is where people are having problems with the side pieces built from bag #2 not fitting properly onto the subassembly from step 37.2) Another important thing to keep an eye on is the orientation of the parts in the drawings. Step 1 for example has two pieces coming together with a joint line down the middle. Keep that joint line exactly as the drawings show as you move through the steps. On step 4 for example it has the joint line of the parts from step 1 going from upper left to lower right – keep it oriented that way until the drawing show it otherwise even if it is hard to see in the drawings. It stays oriented like that until step 15 where it shows to rotate the part when adding on other subassemblies. This may seem tedious, especially on a symmetrical section like in the first 14 steps, but it will assure the parts are on properly. This model has a lot of parts and one mistake early on can result in something no fitting later. Lego does not randomize the drawings, they are oriented the exact same way in the next drawing unless they specifically show a part rotated.3) After each step look at what you built and make sure it looks EXACTLY the way it shows in the drawings. Count the number of exposed pegs on each part and double check the assemblies are built properly. If it’s not the same as the drawings fix it now before moving on.4) Open one bag of parts at a time and organize your larger parts into groups before starting to build. This will make you build go faster and you will have a better understanding of the parts you have to use. For the parts in the smaller bags I usually dump those into a container to keep them from rolling all over the table and getting lost.5) Make sure you use the correct parts. A lot of parts look similar or have similar colors, so this is where organizing parts as in #4 above really helps. This may be the source of some reviewers stating their set has missing parts when in fact they used the wrong parts in an earlier step, and now think the set has missing parts.6) If you get tired take a break. This is a big model with lots of parts and you don’t want to make a mistake and regret it 100 steps later!7) Before you give this set a bad review because you can’t get a part to fit or think you are missing a part, start a review and include some pictures of the area you are having problems with. I can almost guarantee you that you have something not put together properly.