I took the STL file of the solar panel from the specification of the challenge and converted it into a number of different file formats for people to use. I hope this helps. It is just a box but I thought the specific dimensions would be nice.
STL (Stereolithography, filesize: 684 Bytes), OTHER (Other, filesize: 61.5 KB), SLDPRT (SolidWorks, filesize: 105 KB), IGE (IGES, filesize: 38 KB)