Third floor spare bedroom renovation

So the main spare bedroom is underway. The first task was to remove a very strange set of closets that had been haphazardly installed. There were four solid handmade pine doors across the outside wall. Behind each was a bay with a hanging bar and each bay was lined with cedar particle board. Now I am making this sound a lot better than it actually was. The cedar board was screwed in with dozens of drywall screws, the design was all wrong for the house, and it was unfinished. The good news is that when I took the unit out, most of the solid pine that was used was recyclable. I will use this wood for shelves in the attic studio. The closet was not too difficult....easy in fact compared to the floors.

The floor was painted around the carpet which was both good and bad in terms of sanding the floor. The painted area was a top layer of acrylic, a layer of glue which held the carpet, and two more layers of paint. The disc on the sander hits this and immediately gums up. I picked up a heat gun and tried to remove all that I could before sanding. This worked a bit better and I have made some progress. The area that was unfinished has had so much foot traffic without the protection of the carpet that the pine is more of a grey color than a patina. The area under the paint has a more of a patina to it and matching that to the grey dirty area has proven difficult. Eliminating the rectangle in the middle of the floor will be a challenge. Here are some pics.

Before:

Here is the sandpaper pad