As an academic exercise, I checked which lens/shutter is the largest one I own that will fold in a Technika, and I can say definitively that an 8.25” Dagor in an Ilex #3 shutter on a flat board will close in a Technika, so a 7” Dagor in any shutter the same size or smaller should close inside the camera.
In practice, though, I use the 8.25” Dagor as an 8x10” lens, and I have a 210mm Symmar convertible that makes more sense for 4x5” in that it uses the filters and shades in my 4x5” kit and has more than enough coverage for 4x5” and is cammed for the Tech V. The 210mm Symmar does not close inside the camera.
In practice, though, I use the 8.25” Dagor as an 8x10” lens, and I have a 210mm Symmar convertible that makes more sense for 4x5” in that it uses the filters and shades in my 4x5” kit and has more than enough coverage for 4x5” and is cammed for the Tech V. The 210mm Symmar does not close inside the camera.