I just completed my first DIY hammock and tarp (pics coming soon), and I'm ready to start my underquilt. I've read many threads on DIY UQs, but I'm wondering what the "latest" is in design evolution for nylon down filled UQs. I'm thinking I'll go full length (I figure I can always vent if needed) and 3 season, sort of like the 3 season Incubator. I've seen parallelograms, darts, tapers, triangle thingies, end channel draw cords, etc. What works best for you?