I've seen one made out of brick and a steel top with removable burners that was pretty cheap and easy. Get a bunch of bricks, some tubing for ventilation, make your own mortar or buy some, buy a steel top The nicest would be to buy a full wood-burning stove to put on some slabs with some fireproofing behind. https://poal.co/s/offgridconstruction/209058 I've seen several ways but it depends on how much you want to spend. Cheap would be the one above