Hi! It's me again with my wall. It turned out not to be load-bearing, so we've knocked it down. However, what's left are the boards (I don't know what they're called) that make up the "frame" on the ceiling and floor. We have a layer of sawdust in the attic that we're afraid might collapse if we remove the ceiling part. I'm attaching some pictures here for explanation.
What I'm wondering now is if it's okay to just pull off these parts on the ceiling and floor and then fill in to level with the floor, or if we need to saw off as much as possible (maybe with a multi-tool)?