Just completed intallation of the 6' x 8' Palram hybrid greenhouse.  No missing parts and everything went together without any issues.  Excellent directions.  I read through the directions a few times before starting and that was helpful.  Very well engineered and it comes in just one box.  A few days after I completed the installation we had a significant wind storm with sustained 25+ mph winds and gusts even higher for a day and a half.  There were no issues with the greenhouse.  I ensured that the base was level and square as the rest of the install depends upon that, and don't forget to slide bolts into the slots when called for!