Good thing I have put one of these together before, the pictorial instructions were a little vague.  The greenhouse I already have has a swinging door, I thought I would try a sliding door type.  The swinging door seals much better. I have ordered some brush type weather stripping to see if I can get the sliding door to seal better.  Also the roof vent slides sideways, making it difficult to close (no stops on the ridge) I'll have to work on that.