It was built in 1920 and had newer sheetrock in most rooms over ancient wallpaper that was over the cloth, which was nailed to the boards. That cloth has been a pain, because it's stuck behind nails that I can't get a prybar underneath to pop out. Blech. The sanding is mainly to remove the marks left behind from all of the mold.
Definitely didn't plan on this undertaking, but Hurricane Ike had other plans.
There has been a lot of very useful information provided that I'll put to use. Never would have thought about flipping the boards (although it seems like a no-brainer once you hear it!), but plan to save that for a future project. Now if I screw something up, there'll be a backup plan!
If I can dodge the layoffs at work and figure out how to keep working on this place with yet another pay cut that I'm sure is coming, the old place may end up as my primary home one day!