This is a printable mold so you can cast Moai out of something else. Note that the neck is a little narrower than the head, so you'll have to cast out of a material that is at least a little flexible to demold.
I used Oogoo..This was a bit of an experiment to see if casting something larger in Oogoo would actually work at all. It turns out it works beautifully, and I'm pretty sure I could go much larger...I would however recommend you try your hand at casting a few smaller things with Oogoo before you try something this large.
You can find the recipient for Oogoo here:
Oogoo sets in less than 10 minutes, and is cheap and easy to make from stuff you can by locally. Give it a try!