7x17 is quite an extreme panoramic format. Wider than most cinema films or modern TV's or your phone held horizontally. Using it in vertical orientation gives a unique but rather stretched image. It seems to be OK for some subjects like trees, but could it be used for Human portraits?
I only have a 355mm G-Claron which is a short focal length for 7x17 so due to time constraints and to avoid any possible distortions and problems with bellow extensions I didn't fill the negative with the subject. The images below are quite a crop from the original negative but I have maintained the 7x17 ratio to give an idea of how it would look.
Avoiding cramping the subject at the sides results in a large amount of negative space which to be fair I don't mind. This was a quick and simple setup but with some invention and creativity you might be able to produce something interesting. What do you think?