I noticed that the belly is Skin On. I just made some bacon with the same Costco belly last week, but I did cut the skin off. I am not sure how the cure penetrates skin and since I had never done a skin on bacon, I chose to cut it off. It made the bacon a bit thinner than I normally do, but still turned out great.
I use maple sugar for my curing. Nice taste, but when fried, it does get a tad sticky. Worth the trade off to me. Here is how mine turned out:
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Good Luck and Enjoy.... You will never go back to store bought!
HowlingDog