I stayed at POP last week for just one night and left very early on Tuesday, my departure day. I was in the 60's building, poolside. I walked the long way around by the lake to the front entrance. At 6:15 in the morning, there was hammering and drilling and I heard it quite clearly. I heard no noise inside my room. It's possible that rooms closest to the construction on the lakeside of the building, may hear some hammering while in their rooms, but I would not say that it was terribly loud.
On a different topic- this was my first time staying in a value resort. We almost always are at the Poly or more frequently, the Swan/Dolphin. I had read great things about Pop on this board and it was all true. I thought the resort was well-themed, the pool looked like fun, the buses were frequent and prompt, and the service was excellent. I would stay there again without reservation.