woah sorry I'm so late to this. lol. My dad has a fold up n-scale board in his basement. Overall its a bunch of ovals with lots switches between all of them. He thought about adding houses, trees, and such but never got to it. I would put my toy dinosaurs on it and play Jurassic park as a kid lol. My uncle made a HO scale train room in his basement. There's a helix mountain, tunnels, and rivers. He like put tons of man hours into it. I don't know how much he actually plays with it any more though.
Feel free to message me any questions, I'll try to help the best I can!
Rummy- Mini Rex Rabbit
Diz jr- Betta
Yoshi- Crested Gecko