Casa is right. Jon is a friend and he is tall. He will dial you in. He used to ride fish 1ft + under his height. He knows the range. I’ve had multiple iterations of cc fish. For me, I like around nose height as doc said. I like a little thinner and narrower though than stock dims because I stretch out the height a bit. I think age is a factor too. The younger you are, be more aggressive with shorter lengths. Another factor, boards you ride. If you ride HPSB then go shorter. You a long boar mid man, go longer. I just got back from mainland Mex, waves got small. I borrowed a Mabile twinzer fish multiple times from a guy 6 in taller than me. It went fine but the tail had 2 incuts which made it super fun. Bring the tail width in, you can go longer than people think. But that is another design discussion. Last-you may want to find a used one. That will help teach you what you can handle. Then order a custom. You will probably screw up the first order anyway (especially if you fixate on volume over length, width, and thickness). Last, last-glass on keels turned my fish on. Would never order without again. And I really don’t understand why that would matter so much over properly placed futures or something. But whatever.