1. No newts have escaped in 6 months. I've seen them climb to the top on a few occasions but never attempt to walk upside down. Tiny, wet metamorphs may be able to stick upside down so I wouldn't risk them in a set-up like this. A newt with any weight would struggle to walk upside down on a smooth surface.
Thanks, I was trying something similar for a squared pond I have, but I didn't dare.
2. No light - all my tanks receive natural light.
Nice newt room
3. During the night the kaiseri are quite active so I see them regularly. I also see their faces when I hand feed them - they tend to hang out under the same few rocks so they're easy to keep tabs on.