Report_34: The next logical step was to connect engine and cooler. The right distances I could read in the drawings. The lower tube was made by a piece of wire, colored in black and glued with CA glue. Report_35: The upper tube was made with the original paperparts (two paper rolls). The last piece of the tube on way to cooler, I used a piece of cellular rubber. The cellular rubber was still elastically after gluing it with CA. So I have some play by mounting the engine into the chassis. When I looked at the pictures I was disturbed by the view of the red colored oil filler cover - it looks not good. Report_36: The solution was easy. A little ring of paper and a punched, wet formed disk of paper were glued together and colored red. Ready was the new cap. Report_37: The new cap glued to the oil filler - looks better.