Very neat! How about drawing the turbine shaft as well and adding the bearing housing? Although a Compressor wheel will not usually have a hexagon nose unless the threads are within the bore of the compressor wheel and you can use that to tighten it onto the turbine shaft. Also, your compressor housing needs either holes where the backplate needs to be fastened or a flange for a clamp that corresponds to the backplate flange. there needs to be a slit in the intake of the housing where the ported shroud (anti-surge holes) terminate. Very good rendering!