John can of course pipe up here when he sees this but I am almost certain he bought Clay Harmon's Phillips 7 x 17. I would highly recommend the 7 x 17. I have that format and it is a great format. I would just shoot it as the complete 7 x 17, marking lightly the 7 x 14 dimensions on the ground glass with the ability to still see the entire frame and then cut the negative down when you wanted to enlarge it. The print you have stated you wanted of mine was a 7 x 17 negative cut down to 7 x 11 so that it would meet the requirements of the charity event. Having the 7 x 17 would allow for second negative to be shot, kept as a 7 x 17 and contact printed as well, which is a great contact print for pt/pd and other alternative process's.
As to the weight of the Phillips 7 x 17 it was definitely made for light weight field work. John's Phillips is the same one I own and although it has a somewhat short bellows it was designed with a minimum of weight as one of its defining characteristics.
Hope that helps
John please correct me if I have the make of yours incorrect. I posted on memory which is failing me at best these days.