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Elements for every step (plus some others), so plenty of room for a single through-hole on one side when convenient. You can even use a 3.5mm drill bit to get proper hole sizes threeUHeight = 133.35; // overall 3u height panelOuterHeight =128.5; panelInnerHeight = 110; //rail clearance = ~11.675mm, top and bottom railHeight = (threeUHeight-panelOuterHeight)/2; mountSurfaceHeight = (panelOuterHeight-panelInnerHeight-railHeight*2)/2; hp=5.08; mountHoleDiameter = 3.2; mountHoleRad =mountHoleDiameter/2; hwCubeWidth = holeWidth-mountHoleDiameter; offsetToMountHoleCenterY=mountSurfaceHeight/2; offsetToMountHoleCenterX=hp;//1hp margin on each copy of MIT License (MIT) Copyright.

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