Some treehouses and arms, as built by imps.
The shape of the houses is more dependant on where on a tree it is built rather than cultural reasons, accordingly you can find several of the shown types in a single settlement. Twine (in any of its meanings) is the main building material, along with branches, mud, skins, hair, feathers and plant fibers. The morte stable parts of trees are the preferred building sites, with the outer parts that are more affected by wind being used for storage or to house low-ranked tribe members. Many cultures also dig tunnels between the trees' roots as storage rooms and retreats from bad weather and dangers.
Weapons are mostly fashioned from wood, stone and bones, with iron being acquired from humans, halflings or eldritch races. Since most imp cultures lack the technology to forge iron, the iron pieces are ground into the desired shapes. Weaponry is mostly small, light and easy to transport, consisting mostly of daggers, clubs and spears, with some throwing weapons in between. Particularly notable is the angled dagger, a stabbing weapon that allows a good force transmission when being held in a long hand (or foot).