Some advice since I have been here done some of this:
- Cut your PVC pipes lengthwise for the tunnels, otherwise you BP will get in and you won't get it out easily if needed.
- Nix the driftwood idea, it molds quickly in higher-humidity environments and is almost impossible to clean and disinfect when your BP makes a mess on it. There are PVC/plastic options, or you could make your own PVC pipe "jungle gym" instead for climbing options. I have a few that disassemble for cleaning, so they fit easily in the dishwasher.