Since I’m going to use some sketches (even if schematic) that not all of you can understand – because you have never studied architecture or technical drawings, not because you are stupid! – here you can find a list of references to understand what exactly is a plan, a section and a perspective, and how to draw them.
In the future (probably in another life) I might do something myself.
- Orthographic Projection (I’ve found this nice website just now; it’s very intuitive and easy, with animations and good exercises – you can also draw there. Check it out!)
- Video of Orthographic Projection Drawing Tutorial