LNT all the way! I should have been more clear in my original post :-) I was hoping to find a way to incorporate the idea into hammock camping. I figure chopping a frame for a real bushcraft lean to shelter would detract from the comfort provided by hammocking
I was thinking of using a tarp-set up for the shelter and using smaller campfires in established fire pits or small pits built off trail in as responsible a way as possible.
As far as needing to keep the fire going...I figured the oven effect would help with this. I also found this:
A smaller fire could be made that would last long into the night, and the hammock oven would keep the occupant warm a while after the fire died out.