That is great, thanks for sharing. Sure beats lugging around a monorail 4x5. Tilt lenses are nice also, do you have one?
Of course to have verticals non-converging the camera back always has to be adjusted; that is the key point, the film has to be parallel to the structure. Of course everyone knows the cool thing that when they built the structure they made it plumb, so by making the film plane plumb you have made it parallel to the structure without lasers or complex triangulation . Obviously in a camera like this the tripod head performs the function of film plane positioning, allowing an infinite number of choices in horizontal and vertical positioning.