Checking on the insulation

Surprisingly, this house was actually insulated for the most part through blowin cellulose, but there are some spots that didn't have any.  I also talked to my neighbor and he said that attaching drywall to other materials (like lath), and he said it generally doesn't stay on long term, especially on ceilings, so I'm just going to take it all out and replace it with fiberglass then mount the drywall directly to the studs.

I also decided to look down that cavity next to the chimney, it's just open, but there's one of the main supports for the house at the bottom, so unfortunately there's no reasonable way to run an HVAC duct through there for the upstairs like I wanted (so I could remove the others since they'll be a pain later).