be careful quoting the manufactures their only interested in selling their product in particular i note all the rubbish on the fotoman web site re film flatness - any of the removable cone type cameras are able to have a spacer inserted between the body and the cone all you need is good quality fibre board a fret saw and some creativity
or a friendly machine shop to machine up an insert. Perhaps pauls afraid of the shen hao 6x17 which being a bellows camera will focus as close as you like and will also give substantial tilt and shift (fotoman can do this ?) and will take any kind of lens without having to change focus cones all the time