Before starting with the design we should define the thickness of the materials that we intend to use in the building process, to be sure that, when we go to assemble, all the parts fit perfectly.
So I took 10 small pieces of paper that I then used (160 g/m2) and I measured the thickness of the stack. The same with one small piece of cardboard. With these measures, I calculated the thickness that would have in reality for a given scale, and I then used that measure in the sizing of the parts in the drawing. Remember that we design the model in SketchUp at actual size!
So, in the drawing, the paper will be about 0.5 cm thick and the cardboard about 1.5 cm.
Now we have the plan, the scale, the thickness, and we can start by drawing the parties.
....... To be continued