From time to time, I have access to some great material, the holes are smaller than 1/8". Stainless and heavy gauge. A piece about 20 x 20 inches was about 25 bucks. I made a hinged false bottom, used a guide on a angle grinder to make almost a perfect circle. Once cut in half however, and adding a hinge, they are no longer perfectly round. It still fits the keg nice, but leaves a little larger gap around some parts of the keg than the other. If you had a cad program on a water jet machine, you could take into account the thickness of the cut, the hinge, etc. It is hard to make a perfect copy of a production model such as from Sabco etc.