This is my first dealing with MLD so I cant say much about how they list the weighs of their products.

For a ground cloth I was thinking of ordering a padded ground sheet from Suluk 46 1/8" X 25" X 74" - 2.2 oz (62 grams) It can serve double duty, to insulate and protect my air pad or bivy. I also carry a pancho, if I am not going to be above tree line, so I can always lay that down as well. But if anything I can just cut out a piece of painters plastic for ground cover.

In the summer I will need more then a headnet over my sleeping bag for bug protection, so was thinking of trying my hand at sewing a MLD bug bivy clone or a SMD meteor bivy which will add about 7oz more.
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My gear is no where near lightweight