I am in the process of putting together the Thunder Tiger 40. Currently the only problem I have is with FedEx not delivering my radio and servo's Other than that its been pretty straight forward. The notch in the tail is pretty small for the push rod connectors that they give you. I ended up buying some different push rod connectors. Also, its not real clear on where the fuel tank is supposed to sit. It won't fit correctly up front, so I placed mine right in front of the servo tray. After I fitted foam all around it, its nice and snug.