I want to make my own hammock and underquilt. Just haven't been able to shell out a little dough for the materials. If I don't make a mistake, the hammock would only cost 12-15 bucks plus shipping and handling for the materials. Plus I have the option to customize features. Underquilt on the other hand, would probably cost around 50-60 bucks depending on insulation materials, but I'm betting the error cost be higher. Someone on the hammock forum had a calculation on how much down to use and what the projected weight, temp rating, and stuff size would be. When you use synthetic, my biggest question is the stuff size..What if my volume end up being more than mine 15 degree sleep bag? lol. It could become an expensive learning curve.