The answer depends in part on the camera you're putting on the back. I use GFX with a Rotafoot. There's adjustment room in the Rotafoot to go up or down from the standard neutral position, but if you want to rotate from landscape to portrait, the camera body prevents you using that additional space.
So... with a GFX camera (all bodies but the 100, which needs a special Rotafoot), the Rotafoot is set in its default position. The front standard is set to 10mm rise. The rear standard is in the lowest position. From that starting point, you get the following:
- 50mm rear rise
- 10mm front fall
- 30mm front rise
From this you can see that if you combine rear rise and front fall you can have the equivalent of 60mm of front fall or rear rise.
If I want all the movements to be on the camera, I'd use more front rise to set my starting point. For example, if I rise the front as far as it will go, I can have 30mm of rear fall (which is the same as front rise of course, but then the lens is staying put).
For shift you get 25mm left and right using the geared wheel. There's tons of cheat room though. You can add extra shifting by either sliding the Rotafoot left and right in the clamp (20mm is easily possible), or you can slide the front lens frame left and right in its clamp (also around 20mm).
With a GFX camera, keep in mind that you're only getting 28-30mm of shift/rise/fall with most lenses before you see mechanical vignetting from the top edge of the sensor cavity. To use all this movement room, you need either a medium format back, or a camera with a shorter flange distance so the sensor cavity isn't as deep.
