I guess I don't understand your question about what kind of shelter? I string it up between two trees, about 15' apart. I opted for the XL rain fly, so I stake that down on one side and then use my hiking staff to make a shelf above the entrance end. On a cold, wet/snowy night I will drop the shelf and close the rain fly around the hammock (it velcros along the edges).

http://www.junglehammock.com/models/northamerican/index.php

There's the link to the hammock. Has some good pictures of the setup.

As for insulation, the hammock is its own. On below-freezing temps, I'll bring a 0-degree bag. Other than that, there's no need for other insulation.