I am using BLE4.0 and Microphone on my pi-zero. What are the case dimensions required?
You can find the official Mechanical Drawings on this page where they provide - unfortunately - only the schematics of the Pi Zero, Rev 1.2 (pdf). Rev 1.3 however differs only in one aspect: it has an additional fine-pitch connector for the camera, see here (with photographs and everything). This connector sticks out on one side of the PCB for about 1 mm and a length of 17 mm (see crude adapted schematics below).
So this is the Pi that has to fit into your housing. As for the additional components, well that is completely up to you as we do not know anything about their dimensions.