It's hollow inside means that it must be filled to achieve its full potential.
The large hands symbolise a helper; someone who reaches out to people in need, someone with whom people can make contact, someone who can console and protect. They also represent the large range of different partners involved in the project.
It's two gigantic feet, symbolise its movement. He travels from city to city to spread warmth, wherever it is needed.
When he is no longer needed, he moves on, looking for new places to visit and people to help.