Home improvement

Apparently home improvement doesn't work like they show in those reality TV shows. I am at my brother's place and thought that while I am there we could improve the place since he recently bought a house and it needs some upgrading. My plan was, we take the dining room and paint it and change the old carpet. So far so good.
There were some tapes covering up cracks and I decided that they should be done away with for a proper job. When we started removing the tapes, parts of wallpaper came off, so I thought we might as well do away with the wallpaper. Then, at some points, removing both caused the plaster to fall off. So we decided to take off the plaster where it was really damaged and put up drywall there.
The scope of the project was rapidly expanding. While removing stuff in the room we also noticed a piece of the carpet soaked and stained with cat pee that was covered with a mat.

Then I noticed that some of the ceiling tiles showed water damage and they were ugly anyway so why not see what's behind them.
We found some plastic covering the whole ceiling. Cutting through it, it looked like there was significant water damage at some point which was covered up by a false ceiling. We decided we could do away with the false ceiling and put up drywall (or plywood) and make it a better looking ceiling. I did not foresee how much our job would increase with that.

For some reason, there were insulating foam in the middle of the ceiling. Now all the plastic's gone and the wooden slats in one direction from the false ceiling are gone. Removing the rest of the wood doesn't look like its going to be easy. What I thought would be a 12 hr project seems to have turned into a 2 week or so project.