Don't have money to buy a titan? Make it yourself! From other models' leftovers, indeed. We don't know the author, but his creation looks magnificent.
Sadly, we couldn't find photos of both assembled and painted model. If you know, where to get them - feel free to post them in the comments below.
And here's the official model, if you've forgotten how it looks.
Creating terrain can be even more interesting than making models. So get a nice base for your terrain here