Measurements

Hey all, does anyone know of the exact measurements(in units) of the 1x1, 05x05 or 075x075? It would be helpful for im going to make a replica of my house :3

? I’m just gonna explain a really simple method of meausurement I use, it’s that 1 small phx plate is 50 units of measurement, from that it’s easier to figure out more exact measurements.