I took on this job. Got to build in a new outside wall for these windows.
Today, we stripped the inside wall to see what damage there was. Not much water, but more termites. He has had the house treated, so no live ones were found. This must have had a picture window with two small windows beside. They took that out and put the two smaller windows in. But, no studs to the bottom plate. That let the wall sag inward. I hope to remedy this easily, but may need pontoons to work under the floor.