Overall, it was easy to assemble, but there were some exceptions. It definitely takes at least one full day to assemble, much more than 3 hours.  There were some predrilled holes that were too small for the supplied “LL” screws.  This required a trip to the hardware store to find appropriate nuts & bolts, since screws were not suitable.  It was also difficult to align many of the roof screw bosses with the corresponding screw holes on the roof truss.  Initially when installing the roof panels there was a gap between the roof panels progressively larger at the lower edges, but by applying force, I was able to close this gap.