"Having built the UCS Millennium Falcon some time ago, I was ready for another challenge and this model has become my favorite Lego build. While working on it I was inspired to learn about the real Bugatti Chiron and I was blown away by all I learned, from Buggati's history to how the vehicle is assembled and it's capabilities. The car is an engineering marvel. As I proceeded through the build, I could see the level of detail that the Lego designer put into this model. The bags are numbered which increased my enjoyment. However, after the "marriage" part at stage 6 I tested the wheels by spinning them by hand and noticed they would spin only a turn or two and then stop. I disassembled most of what I completed and located that my mistake was in the gearbox with the orange pieces that engage the various gears. I didn't have those orange pieces sitting correctly so there they would be able to engage the gears. Based on some similar problems I've seen builders have on YouTube who unfortunately discovered a problem with the wheels not turning after the model was completely finished; I recommend testing the wheels to make sure they spin after the marriage where you join the front and rear halves of the model. The wing was also a bit of a challenge for some reason, but it ultimately came together perfectly. My second suggestion for builders is to take their time and enjoy the process. I've seen several videos where people try to rush assembly and ultimately make a mistake. Even with my mistake this was a great experience and I enjoyed putting the model together and learning about the real Chiron. The model looks great and the more you learn about the real Chiron, the more you will appreciate what went into designing this piece. I enjoyed the Chiron so much, that I ordered the technic Porsche which I had to get from a third party because it is a retired product. From what I see, the Bugatti blows the Porsche away, but I got addicted to the engineering that goes into these models."