The Sad Fate of the Woodins
The moral of the story is, read the directions:

So the woodins felted happily–just a bit tighter, but stitches still intact. But their home fizzled on me. At first i thought it was because I overfelted–and I am a bit sad, after all the work I did making a tree-bark pattern in purls, that most of the texture is felted away. But the real problem, the tree-trunk turned completely flat (this tree is so flimsy you could wear it as a sweater), was a pre-felting mistake.
When the pattern says stuff, stuff. The tree was standing up okay on its own, and the 6 pages printed up from Knitty were shuffled all over the house, and I thought I knew what needed to be done to finish it off, and I just didn’t read the part about stuffing the tree. Now it’s sewn, and felted together, and i’m a bit unsure what needs to be done to fix it. The first step will be to try to cut open the edge and get some stuffing in… but i’m a bit worried that the outer and inner layers have felted together. hmmm.
Will keep you posted. Until then, the poor woodins are homeless.

Poor flat tree. Can you put some wire in it or something? It might be easier than stuffing post-felting.
Aw. But they still look happy. . .