Thanks for the positive feedback folks. I'll keep adding progress pics if anyone is interested.
Lots of progress. I got the majority of the undercoating off. I still have some small areas to clean up a bit more. Mostly it was removed with fire and scraping. Then cleaned it up with a DA, and wire wheel on the grinder. Also used some paint remover in tight areas.
I'm very happy with the condition of the underbody. You never know what you'll find when removing undercoating, but this car was 99% rust free. Just a couple areas of surface rust, which I'll fix with some body work. Also got the firewall stripped. Found a couple numbers under the black paint. Also found big check mark. Not sure what that was for. Here's a few pics.
I still have to remove, and redo the seam sealer.
Also got these 2 pieces done today.