Shared
Half-overlay and inset panels are distinct from full overlay in that intermediate panels are shared and panel thickness (instead of panel reveal) determines box height (and width). With half-overlay and inset cabinets, panel reveal is fixed at either panel thickness plus face reveal (inset) or half the panel thickness plus face reveal (half-overlay). With 19mm (3/4") material, all system row start holes are 9.5mm.
Shared Panel Height (SAC)
Like full overlay panels, all shared panel drawer and door edges are an equal distance from a system hole. Unlike full-overlay boxes, shared panel box reveals are always balanced and panel thickness determines the box-to-face reveal. With half-overly and railed-inset panels, system holes can be used as construction holes (SAC). All horizontal panels can be indexed to system holes.
Half-overlay and railed-inset panel heights are always a multiple of 32mm plus panel thickness (e.g. +19mm constant). Being a balanced panel, half the panel thickness added to the top and bottom of the panel (e.g. 9.5 + 32xn + 9.5, AKA 9.5/9.5 starts). Shared panel box top and bottom reveals are always the same as the box side reveals.
Half-overlay box reveals are always half the panel thickness plus the half the face-to-face reveal, e.g. 11mm for 19mm panels (19/2 + 3/2). Inset box reveals are always the panel thickness plus the face-to-face/panel reveal, e.g. 22mm for 19mm panels (19 + 3).
Half-overlay (and no-rail-inset) faces are the same heights as full overlay faces (32xn - reveal). Railed-inset faces are always some increment of 32mm minus panel thickness and 2x reveal (e.g. 32xn - 19 - 6).
Only the half-overlay and railed-inset panel designs can use system holes as construction holes (SAC). With SAC panels, all faces edges center on system holes. They have good top/bottom clearance for drawers and I have never found a need to center face edges between system holes (useful with the lesser clearances in full-overlay boxes).
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