I did one a while ago, you may have even been referring to mine. I can't find pics anywhere. I think I deleted them because it kinda sucked. It had potential, but at the time I was more concerned with making it cheap/inexpensive, mainly because it was huge. I used a bunch of foam board, but did the floor in balsa wood, cutting all the little spacers for the grating by hand. I'd do some things different now, some things the same. Come to think of it, it was OK, just very big. Had lights in the floor and an open garbage chute for someone to dive down. I'll keep checking around for the images, I doubt anyone here would have saved them. Anyhow, I look forward to your take on it. There are a few different display options for it, so it should be cool.