At this point, the frame is complete, and feels very sturdy. Its not too heavy, since I carried it up the stairs from my garage by myself. I did notice it is not perfectly square, but it should be fine. I used a plain
circular saw to make all the cuts. A table saw would have been better. The first picture shows it in place. I placed an old blanket in it before the liner to protect it from any tears. I would suggest it. Some people recommend using the blue styrofoam board used in building construction. The second photo shows the liner in place and the water starting to go in. Make sure you have extra liner on all sides (you can cut the excess later) when the water goes in, it tends to pull the liner tighter.