Very parochial stuff, of no interest but the utterly geeky with a bent for Microsoft isometric diagrams in Visio:

Microsoft’s 3D server stencils are transformed by 28.55° not 30° used by most isometric diagrams, and I think that equates to 1 down, 2 across in a grid that is 2.5mm by 2.72mm, but my trigonometry has failed me…

Great, got that off my chest.