I'm not at my boat now but can measure it tonight if you don't have an answer from someone else by then. The floor width is in the neighborhood of 4', although the gunnels flare out quite a bit since it's a dory, giving the beam spec you read on the website.
What I wanted to comment about are your observations about the manufacturer website and the print literature - I couldn't agree more and at the Factory Tour last month several people made that message loud and clear to them. But, don't hold your breath for updates anytime soon! The C-Brats is their strongest marketing tool, and costs them nothing, so you've come to the right place for the information you are seeking!
-Mike