Ah - I'm downloading it now. But meanwhile, I found some random box which i scaled up. I also found some random dirt texture which i put on a one-sided square inside the box. I'll show you the material I did for the dirt. I added some displacement so it looks less flat, in addition to doing the AO on it and the box and the ground.

I put a Poser Hi-res sphere in to give you a sense of scale. I'd use a figure but that will make my test renders long - i'm trying to go fast.

Here's my box of dirt without AO. Click for full size.

Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)