I was involved with a similar calander years back. We had image size/resolution requirements and a deadline to get the photos in. At that point, we set up a voting site, where members could go in and choose their 12 favorite images and click on a voting button next to the images. Members were only allowed to go through the process once. This was the fairest way to choose the vehicles. If whomever is spearheading this would like me to look into it, I would be more than happy to do so.