On mine (an original Kickstarter version), there is a practical minimum focal length of 110mm. This is based on the closest mounting position for the front standard. So you won't get a 90mm to focus at infinity on an unmodified camera, which may be important if the 5x4 back is attracting you. I tried making a small adapter to let me mount the front standard further back, and focus is possible, but movements are (very) bellows restricted.
The back is removed to change orientation (you can take it off and fasten it in any of the four possible orientations). The 5x4 back actually rotates in the mounting.
On mine the bellows extension is a touch under 600mm. You would certainly need a top hat board to get much closer than infinity with a 600mm. I'd say this is a camera that works best in the 270-355mm range, with bounds of 125mm and 450 or 500mm. Very light, but maybe not as rigid as some. I use a Sinar to Linhof/Wista conversion board, since all my lenses are also used on 5x4 cameras where that is a workable standard.
I have found that I can do 4x10 using a simple mask placed between the back and the bellows which is handy.