Tell us about yourself!
I tried a few different iterations but then got distracted and left it half intact. My recommendation is to use smaller personal misters rather than garden misters as they disperse the water into smaller drops.
To be completely honest, I haven't tried this in years. It might work but I've been tempted to take down the article until I could verify it. I can't imagine the desktop files would have changed that much but there might be a few minor tweaks that need to be discovered.
Yeah, you should be able to in step 6 by replacing the chromium line in /usr/share/xsessions/chromeKiosk.sh with your own application.
If I recall correctly (and it's been years so I may not), you don't put anything in and it will prompt you for it as you boot up the system on each new machine.