We Aint Movin Mountains, We're Buildin' em!

So, I am anxious to spread the good news, of... I BUILT A MOUNTAIN. I've done some cool terrain projects before, but in the scope of WWI and cities, very few are monumental in scale. My cities are short, because that makes everyones lives easier. But today, out of the blue, totally unplanned, I built, a mountain. So here it is:
I know, it's more of a hill, but that's besides the point. So why is it so ugly? well, it's unpainted, but I wanted to leave it unpainted, to show you the building materials! sooo, here's what I did, I build up a base of styrofoam, use whatever you have alot of. You don't even need to slope the surface, or have a complete structure, a good 30% of mine is hollow. anywho, once you have the skeleton built up, then cover with a ridiculous ammount of toilet paper!!! I used popsicle sticks for the walkway, and I used rocks for the... well the rocks. I'll be sure to post painted pics when I'm done :D