You can use the hoe and stone to raise ground, you don't need iron.. first level tool.


That said the best solution is to build on top of a large rock and use the top of the rock for the fire base.

https://steamcommunity.com/sharedfiles/filedetails/?id=2660632173

https://steamcommunity.com/sharedfiles/filedetails/?id=2660632375

https://steamcommunity.com/sharedfiles/filedetails/?id=2660632610