Some time ago, I had a dream where I was making a model out of food. I know I was using dessicated coconut for grass, and carving cheese for something else, I can't remember what. Thinking about it more, I figured chocolate would be really useful for glue, and vegetables such as swede, potatoes, squash and celariac would definitely be useful for strong building blocks. If you need a model made of food, you know who to ask.