Here are the 2 types I made. I followed this guys suggestions as I thing he has the best Video out there on making these. see https://www.youtube.com/watch?v=sHAxmOuK3Tg
The pool noodle one is aprox 18 inches with a 12 inch section of noodle. The pvc is 3/4 inch. Inside, instead of rebar and fishing weights I used 3 inch bolts. This bolt u position near the top and when a cat hits it slides down and helps the noodle stand up. It also makes a smack when it hits the bottom and some people believe that makes the cat swim harder thus setting the hook. All hooks are 5/0 circle hooks. The water bottle is a 20 oz bottle , the bottom painted white. I am going to add some reflective tape and glo stiks which can also be put inside. Its hard to see but the noodle one does have reflective tape at the very top. Hopefully sometime soon I can give a report on how they do. They surely have saved me some space as I can get 10 noodles in a bucket. Search you tube and you will see alot of vidoes on making these. Mack