The location randomizer is a really cool system and I'm really looking forward to seeing the other disaster events you have set up. I'll definitely use this cave in system next time I have my players fighting underground!
I have two things I'd like to see in a finalized version of this. The first thing is I'd love to see at the very least some advice if not a whole section on how to convert this to non-square maps (25'x45' for example). I can imagine how it might work but I'd like to see a section in the book on doing that. The other thing I'd like to see is a separate map included as a jpg or png of the location randomizer, either in various sizes (16x16, 32x32, etc.) or as a non-gridded version. That would be really handy for vtts as a quick reference tool and I'd really like to see that included in the download package.