Inset
Shared panel inset boxes can be made with rails between every drawer and door face (railed-inset) or with no rails between the faces. In the later (no-rail-inset) case, a single increment face can be a rail.
Inset Panel Height
Railed-inset panel heights are always some increment of 32mm plus two times half the panel thickness (9.5 + 32xn + 9.5, AKA 9.5/9.5 panels). The inset rails need to be the same thickness as the panels and there needs to be a rail between every face. Having a single rail under the top drawer would break the system because the top two faces (drawers or drawer and door) wouldn't center on/between a system hole and their top/bottom edges won't be an equal distance from system holes.
No-rail-inset panels are always some increment of 32mm plus reveal (split top/bottom) and two times the panel thickness (19+1.5 + 32xn + 19+1.5, AKA 20.5/20.5 panels). While it is called a no rail panel, a one increment face can be be used as a rail. Finger pull rails (e.g. Hafele's half moon rail) can also be used.
As with all panels, face edges (plus 1/2 reveal) can center on or between system holes and which works depends on the hardware you use. While drawer slides are typically the determining factor, the Hafele finger-pull-rail mounting brackets are designed to work with faces edges that center on system holes (the most common/typical layout).
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Railed Inset
With the inset style of cabinets the doors/drawers are inset so that their faces are flush with the face of the box. I remember a Fine Homebuilding article on building inset style cabinets using full overlay boxes and what a lot of extra work and pieces it was. Somewhere along the line it occurred to me that the shared panel construction of half-overlay cabinets was ideal for inset cabinets.
For the example drawing I simply reduced the perimeter of the half-overlay faces by 11mm so that they would sit inside the openings and have a 3mm reveal. The only other difference is that the system rows have to be moved from 37mm to ~56mm (37 + face thickness) from the front of the box. As with half-overlay, inset panels can be balanced and system holes can be used as construction holes. Both styles will only work (seamless box face) when shared panels are used. When using the 32mm system, half-overlay and inset cabinets are as close as you can get to a 'perfect' cabinet.
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