I'm curious if anyone here has experience making artificial hollow logs or branches, rather than finding natural ones? I have a hard time finding anything hollow outside, and they're often heavily rotted or full of life I'd rather not introduce to the cage. I know submerging it for a while would clear out all of the nasties but I don't have anything large enough to soak a 4-6' piece of wood. I've been trying to come up with ideas on how to make hollow pieces and so far all I've come up with is to use drain pipe, pvc pipe, or a combination of wood and foam sheets. Obviously whatever the structure is made of would need to be covered in great stuff, grout, concrete, etc. and then painted/sealed. Also haven't thought of a way to coat the inside properly. Thought about making each half separate and then lining them up and adding more grout to get them to become one piece but this seems like it might not last over time. Any thoughts?