I’ve done the same thing - using a poly cutting board and cutting it to size. I also added a handle so I could get hold of it to remove it from the whey more easily. However, I got to thinking, which is sometimes dangerous, that by using 2 liter bottles for weight and setting them directly on the follower, I was defeating my purpose. The weight of liquid in the bottles would be displaced by the whey around it so that the actual pressing weight was diminished. I reasoned that the weight would have to be above the level of whey in order to be accurate. Was I wrong in this assumption??? Anyway, I used my 6” mold on the follower, and set the weight on top of that to keep it out of liquid. However, when I did this, slipping became a problem. Since its only a 10 minute press, I’ve had to babysit it every minute in order to keep it upright. I was hoping there was a better way of doing this.