I wondered about the cross-arm. It goes against all my instincts for supporting a relatively heavy camera.
I believe that front tilt is base tilt on this model, whereas swing is central. Turning the camera would give centre tilt which might be easier to use when focusing from the foetal position on a pile of sharp rocks. The MPP's rear tilt mechanism might have been easier, if some modest perspective distortion was acceptable
Or, perhaps the focal length lies at an uncomfortable point for close-up work, where the rear rack isn't quite long enough to use the drop bed. He's using a flat lens board. I clutch at straws here.
Despite our comments, it's good to see a photographer willing to describe his process in detail as he is making the image. Seeing it done makes it much more straightforward than written accounts, which can be intimidating for beginners. We must commend and thank him.