What do you mean by "Big Guy" Cobra? Do you want to buy a Cobra that fits, or are you open to building? A Cobra doesn't necessarily need to be stretched to accommodate someone large and/or tall. I had a guy who was 6'11" sit in mine and he could close the door and work the pedals. I'm 6'6", wear a size 16 shoe and weigh 300+ lbs and I fit like a glove. Now, I understand trying to fit in a Backdraft, Shelby, Superformance, etc. may be impossible but I built my Factory Five and was able to do a few minor mods to make it fit just fine.