In this particular case I think there is the extra complication that the ship skin was made of a special material that likely does not burn with the usual wood

In this particular case I think there is the extra complication that the ship skin was made of a special material that likely does not burn with the usual wood fire colors. Combined with the hydrogen on the inside I actually have no idea what color the fire would have been - the most accurate way to restore this would probably have been with an actual eyewitness in the loop, or by restoring a section of the ship including the flammable paint.