I've been looking at under quilts and I really like the 0* Incubator from HammockGear.com. This got me thinking: has anyone made or used a 2 piece Incubator-style UQ? It would be a 0* UQ for the under your body and a 20* or so that could be used under your legs. This setup would also allow you to use the lighter half by itself in the Summer. Does anyone do this?