Welcome to the forum! Are you thinking about building one of these?
I'm guessing that you'd either talk to Simon R Galley (of Ilford) on the board here, or else contact Keith Canham at Canham Cameras for a Kodak special order.
Hmmm, unless Kodak said, "Here's the tail end of a roll, cut it yourself." I think that Manarchy may have mentioned cutting it from a roll.
But OTOH, that means you could have a panorama camera with 4-1/2 ft tall negatives. Have to get ahold of that Bosch & Lomb lens from the Mammoth camera, though.