For a loco which is made of metal there's also quite a lot of wood too.

In the days before plastics really saw widespread use the most effective material for window frames, etc., was wood. Most of the framework which was removed from the loco was rotten, suffering from a combination of exposure to moisture and heat, it fell apart as it came out. Some sections were salvageable, some could be repaired with new wood being let it and some needed wholesale replacement. The photos below show all three examples and well as showing the skill of the person carrying out the restoration of these components.

The final widths of some of the sections is yet to be determined hence the slightly stand-out appearance of support pieces for the quarterlight mountings.