A quick question about the cover
I just purchased a Kukenam Sky from Softopper here in Boulder, CO.  Great folk, friendly, loaded the box on my jeep and off I went.  I had a weekend trip planned, so, of course waited until Friday to even look at installing the tent on my Gobi Stealth.  With a little lift help form my wife and son, I did get is installed.  At the end of it, my forearms and hands looked like they had been in a fight with a cat who threw fastballs.  Not much room to get in there.
As I was getting anxious to leave, the last step was the cover.  I slipped the edge in to the track, and flipped it over the top.  Hmm, nothing obvious to zip it onto.  Strapped it down and headed out, stopping every once and a while to make sure everything was OK.  When I stopped at my chosen campsite off of Gore Pass, I was excited for my first roof top night. Pulled the cover off, unbuckled, grabbed the ladder and flipped it open.  Just as advertised.  That is when I noticed a zipper in the now bottom edge of the flipped out floor.  
So, my long winded question is: Should this zipper just be moved to the lower base attached to the roof rack, or is this a different zipper that may be used to attach a annex under the flipped out portion, and I am missing the cover zipper?.
Thanks in advance, and it was a great weekend in my new tent. 
Jeff