J B Harlin, a fellow Texan from the the DFW area, who designs and builds large format cameras (as large as 11x14), once told me that
the only time a camera needs to remain extremely rigid is while the shutter is open during an exposure.
The best advice I can offer someone who is contemplating the purchase of a 5x7 camera: purchase a
4x5 reducing back for the camera. If possible, one that is equipped with Graflok-type sliders.