In the end, Hally made it so much easier by requesting jarcakes and a small cutting cake. We settled on four flavors and I made them over a couple of weekends, tossing the finished jarcakes in the freezer. We still had to figure out how to drive them three hours in 100 degree heat without them completely disintegrating but stacking the boxes of jars in coolers worked great. I brought the cutting cake and frosted it during the reception.
Since it was such a hot evening and the reception was outside, we waited to put the cake out until it was time to serve. During the reception one of the guests asked my mother where the cake was and she said, "in a bunch of boxes on the counter inside" (hee hee!). I was a little nervous about getting it all set up but with a little help it was quick work (thank you, Andrea and Gage!).