A week or two ago, I happened to stumble on a Wisconsin State Univ. webpage that has many of the answers you seek. Doesn't cover any larger melons, just midsize and down. Doesn't cover all that many midsize either. Tendersweet is MIA, for example.
Thought I was never going to be able to find it again:
http://agsyst.wsu.edu/watermelonphotos.html