In shipping the size shouldn't matter too much, the package will still be as large as your largest panel.
Unless you are talking about a huge box.
They pretty much charge you by the longest measurement and the weight I believe, up to a certain point.
So if your box is 24" x 15 x 15 and 65lbs
Your package broken down will still be minimum 24 x 4 1/2 x 15 and 65lbs
You might as well have it built and save yourself the hassle.
Just a thought.