No missing parts.  Instructions identified the sequence to assemble the parts.  Took a bit of time to figure out that the slots in the aluminum connectors were for the metal screws, a picture showing this would have helped.  Took some thought to orientate the arrows on the connectors in the right direction, up or down.
Managed to put the greenhouse together by myself over a couple of weeks working off and on, a few hours each day in the summer.  This included pouring the concrete at four corners to secure the greenhouse as well as the installation of treated wood around the perimeter of the greenhouse.  
Greenhouse has held up to 40 kph winds and is standing with 1 foot of snow on it at -20 °C in Edmonton.  Good value for the money.