If you can make the kiln, you can easily make lightstrips, which are infinitely better at this job and don’t make you visible.
It stopped when weather was turned from global to local.
I updated the wiki entry for tankbot recently:
http://www.wiki.cataclysmdda.com/index.php?title=Tankbot
They’re surprisingly easy to assassinate at night, but if you see one during the day, just run. Or if your speed is below average, take stimm drugs and run.
Nope.
Glass items will always break (purifier is stored in flasks). Not sure about the others, but don’t think they take any damage. Just grab a shovel, because they’re likely to get buried.