Unless you have a lot of the parts already, it is probably cheaper and, definitely faster and easier, to buy one than build one from parts. The parts are getting hard to find, especially at reasonable prices. At the last show Carl had a couple rounds that were well priced but could have benefited from being re-done (thus discounted to full retail). Not sure if he has them still, but if you are coming up to Charleston next weekend you can see. If all else fails, I have an extra bottom plate