After all this time, I had given up on the rraft, but I still had those 1000 bottles tucked away. When instructables.com released their keep the bottle contest, I realized that I had to start it up again. The new design will require less recycled material (though I still want to recycle whatever I can) and will be smaller, using about half the bottles. Today I went to Home Depot and bought a 40" x 25' roll of garden fencing mesh. I also made two pontoons. Each one is a cylinder made of 78 in. of the fence, and filled with 162 bottles each. They were closed up with zip ties. I plan on adding two smaller pontoons for more support.
The frame will be made of PVC, and so far the platform will be fiberglass resin coated plywood. I'm still looking for other ideas to use instead of the plywood.
I'm just glad to finally be finishing this project!