It is unlikely any part will be salvaged. Reconstruction is
worthwhile only when the fire damage is confined to one area e.g.
the engine or when the damage is largely confined to the area above
the floorboard.
As evident from the TV footage the fire had spread to the faceplate
area, which means the flames burnt through the whole length of the
underside. The only thing probably left is a very brittle and
powdery chassis backbone, anything that came with the chassis are
probably destroyed, including the wirings, transmissions, aircon
units, suspension, articulator etc which add up to be pretty much
80 or 90% of the bus' value.