We have this amazingly old willow in our yard. And it sheds branches. LOTS of them. Our house, before it became our house, was a rental property for some years, and this tree was neglected, if not outright ignored. Branches grew wherever they happened to sprout out, and no care was taken to thin them out or keep the canopy free of deadwood. Hence, shedding branches.
Once we moved in, the yard was quickly tackled. A kind neighbor came and pruned the tree for us (it was crazy. He was swinging around in the tree by one hand, a chainsaw in the other). Between the shed branches and the cut branches, there were... a lot of branches! We put our heads together (as we often do, the wife and I) and began to build!
Though we had a HYOOGE pile of branches, it was rather amazing that we didn't have enough to finish the project in a single season. But with the first stage of building, we were able to get rid of all those branches into something cool and useful!
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Step 1: Large Branches for Framework
We started by cutting down the larger branches (over 2" in diameter) to roughly equal lengths(approx 4 ft.) for uprights. We then cut some for some overhead pieces for roof supports. Due to the irregular nature of the branches, we had to put in some random limb pieces for support, to make sure that the structure would stand on it's own. 3" to 4" grabber screws and a cordless drill are EXTREMELY useful for this step.
Step 2: Setup "warp" in Branches
This is the hardest step to explain,and the most essential. Taking the longer branches and stripping them of any subsidiary smaller branches, start to create vertical "bars" between the existing uprights. This, in weaving terms, is the "warp".Some cord or wire can be used to lash these bars in place while other weaving goes on. Once there are a number of warp branches, the woof (horizontal) branches can be woven in and out of the warp branches. More branches can always be added in for warp or woof as needed.
The pic below is what we were able to finish after the first season. So many branches, it seemed we would NEVER get through them all! But it was surprising that we had no branches left, yet we weren't done with the project!
Step 3: Keep Adding As Needed As Nature Provides.
Doors and windows can be allowed by leaving out branches in the weaving. As nature provides more branches, be sure to weave them in, adding support for your weaving as needed. This is a rather organic, intuitive process, and you will be dealing with materials that are by no means standard in dimension. So don't feel bad if you need to take something apart and restart. This is a work in progress, and has seen several permutations. I'm rather sure that it will continue to evolve. So have fun!