Very cute. Quite the little mountaineer. Do you worry about it falling off of there? I assume it will fall off. The local pet stores also sell a little bridge type thing that has a single purpose of letting little tortoises climb up on it. They readily use them but even with thick "bedding" I don't want my little guys falling.
If you bury the "mountain" a little bit into the substrate, it will lessen the chance of a fall and tip over. The ash tray isn't his water bowl, right?