For the last months, maybe even the last year, I used to draws sketches by hand with a pen on a paper to plan my constructions. It was the easiest and fastest way and I wanted to improve my drawing. Now I had to admit, that some constructions are too hard for me to imagine precisely. So I went back to where I came from: 3D modeling my constructions. Maybe in the future there will be both: drawing and modeling. I like them both!