i think I'm going to use hot glue for my "Build Something" project.
If you're trying for a similar "webbing" effect, you might be able to do it cheaper by using expanding insulation foam, the kind model railroaders used to sell as the "Mountains in Minutes" brand. If you poke and drag the stuff as it starts expanding it produces a very similar look, although it takes some practice to get down pat. Cheaper than hot glue for larger projects, and quite a bit lighter too. Maybe not quite as durable, but partially-collapsed expanding foam is tougher than you'd expect.