The only thing is I'm always surprised how much yarn/string gets used in these projects.
Ha! you too. . . my rule of thumb is 3 times the height of the stitch, maybe slightly less for netting. It works for figure 8 looping (Papua New Guinea, and other locations) crochet (who knew?) and the string bag constructions of the local First Nations people here in Oz.
I'll warn you of one thing... netting tying, macrame and related skills are very, very addictive!
Just so; be warned. Most satisfying when there's a finished product.