Shrinkrap, I am tickled to see you are using some of the same support methods I am. I have had terrible problems with voles spoiling even very small immature melons, both watermelons and muskmelon. Next year I will spend more time training vines up a trellis, so fruit are farther from their reach. I have three melons on an existing support, and found that an old pair of underwear with one leg opening cut open to make straps makes a roomy sling!
I am growing Blacktail Mountain, Crimson Sweet, and a small Russian melon, the name escapes me at the moment. Also growing Halona muskmelon. The melons growing on the ground are raised up on styrofoam plates set on top of used coffee cans. I suppose the voles can still run up other vines to get to them, but I figure at least getting them up out of their pathways might help some. We had a big rain storm last night, so I have not yet been out to see if any got knocked off the plates which had holes poked in for drainage.