Here's an idea.  I think there are better solutions, but this is what I had to do to make use of the space I have. 

The attached picture shows my two fuselage skins (with their laterals and diagonals attached ) clamped together with a bit 1x2 between them and then hoisted up into the rafters.  I was worried about the wind coming though the garage door an blowing them around, but that hasn't been a problem yet.  Bigger problem is that I have to be careful I don't bash them with a ladder or something.

I had some  long (12´ +) 1/4 inch x 3 cedar floor boards from kayak building. By using some big paper clips from staples and clamping a piece of cedar either side of the skin edge, it was a safe way to move wing and fuse skins w/o getting happy faces in them.

Tape the short edges with painters tape and roll them into about a 2' dia roll (you can go even tighter) wrap a turn or two of tape around the top and bottom rolls.  Label the part number with a sharpie on the outside of the roll.  I recall being able to "nest" some smaller skin rolls into the larger skin rolls.  U-haul has heavy cardboard boxes you can use to put the rolled skins into and then store as desired.  Suggest marking the box with part numbers as well. To be even more efficent, you can deburr and/or lightly sand the edges of the skins before you roll them.