The 'Longfellow' is a medium format panoramic camera that utilizes fused bodies of two 6x9 folders. The Super angulon 90 was mounted on a cone. The two backs were held using a fish plate. Though not combined into a single piece,the two pressure plates can hold the film flat quite adequately. The resulting format is 6x18.
The details of construction appears in the book "Medium and large format photography: moving beyond 35mm for better pictures" By Roger Hicks and Frances Schultz, well known for their other books on photography as well. Information on a few other handmade cameras including one made by Roger also appears in the book.
Some discussion in this context can be found in this forum post. I thank Mr. Hicks for granting permission to use these picture. His website http://rogerandfrances.com/ is a goldmine of information on many type of cameras and photographic techniques. Keep an eye over the site contents, as soon a 'how to make it' section will appear there.