My son and I are having a great time building the Toyan Engine (Model# FS-S100AC). The components come well organized and seem to be very well made. The assembly instructions are adequate but we found it helpful to watch the videos on the EngineDIY site for additional clarity. Everything is going together nicely. We did run into a problem with the fan wheel shaft and bearings and am working with Lucas in the Service department to get replacement parts. If I can get the replacement parts and complete the assembly process, I will certainly change the Rating to a 5 out of 5 stars!