The reason why we included this project under our DIY projects is that there are case where buying the finished product is probably cheaper and better quality. That said it doesn’t mean that you can’t be creative and try, as long as you are aware that you might not get a perfect end-result. Your cat will probably be just as happy.
Our cat tunnel was very time consuming to make and lasted about 10 minutes before it was flat (hence we won’t waste your time with the instructions). Having said that, it was a fun little project and just shows that with some imagination and creativity you can make pretty much anything. Just remember it is ok to fail and not all projects will go according to plan.