I managed to get a result close to what I had in mind for this one. Those blocks are always very time-consuming to get right, because of the consistency required between all materials and their blending, taking into account all properties (albedo, normals, heightmaps, ambient occlusion, emissive, roughness, ...) that require lots of care and attention.

So here you have it, the complete furnace block for Realaccurate. First screeenshot's a ray-traced render but the rest are in-game shots.