I made a set that works great! Bill vining gave us the list of supplies. Think it came out to 200$

That being said, my boat is light (f16) and they don't work great on soft sand, but they work fine. I do, however, wish I had a set of real catrax. My tires aren't as big but the gauge of al tube I used makes them relatively heavy compared to the real trax. If my boat were the standard 400lb cat I don't think they would work