This makes absolutely no sense at all. Some stone age cultures were known to burn bone for fuel inside huts made of mammoth bone and thatched with clay mixed with straw. They cooked all their meals on fires of bone and dry dung, their huts smelling of overcooked meat. A pair of huge, matched mammoth tusks would frame out the doorway, the curved tips joined by a hollowed out mammoth femur, a heavy mammoth fur drape serving to protect the entryway. Many of these nomadic plains peoples never saw wood in their entire lives beyond stunted shrubs, using bone entirely for fuel and for building, crafting and weapons. These bone huts served as their winter shelters, returned to when the warmer season in which they roamed the planes ended. They would dig deep into the ground to reach the layer of permanently frozen ground beneath the soil in the summer, then build another hut around it, insulating it to freeze or refrigerate their kills and summer harvests while they lived in a nearby or adjoining hut, without the freezer pit, to wait out the harsh ice age cold in their little round homes made of bones, river clay, and dried grass, heated with fires of bones and dung.

Bone is, in fact, 100% burnable. Older structures were known to catch fire once the clay had reached a certain age and began to crumble without regular maintenance.

Bone burns longer and hotter than wood and is harder to get started. Calcium is harder and more brittle than any plastic, especially once refined. The idea of making plasteel from calcium refined out of bones is downright silly; it seems like every mod that introduces new materials has to make plasteel craftable out of it. At least with the oil it made some sense... Imagine, mixing steel with eggshells. <.<

What bone IS good for is fertilizing ground and bone marrow can be used in food. And huge bones can be used to build, clearly.

In an age before bricks, they made a sort of primitive cement out of clay and straw, plastering it over a web of bone tied together with sinew and dried. These ancient dome-shaped houses had a single hole in their circular roofs, directly over the main campfire, with a hardened hide over the hole attached to an internal handle (also bone) to block or vent the hole as needed to control the interior temperature.

I love the idea of this mod, but it's clear the modder doesn't actually know the subject. I do believe this is one case where realism would be a hell of a lot cooler than just making stuff up. I hope they'll take my details into account in an update sometime.