I can't believe that I achieved this one within less than 15 tries, knowing what I was doing and understanding my 2 steps saver... Could it be that I start being able to rely on my pipelining experience? LOL
After a long time away from that board, I came back to it now and got it within a few tries. The star less is because a big part of the board is for nothing. A resizing combined with a true visual symmetry would be nice.