Thanks, gentlemen.
Des, Aviattic team made all the efforts to provide us with the ultimate kit, with all the imaginable extras already included in the box, as related in Bo inbox presentation and announced in Aviattic website. Without the instructions booklet I cannot tell how far did they really go (I even did not try to analyze what all those PE details are destined for, yet). So I cannot tell now if I will add anything extra. Well, electric wires (my copy does not have the wire bits), oil pipes and rigging will surely have to be added. I have also followed the Bo's idea and provided the engine block with rotating propeller shaft, only that I used plastic pieces. But besides this, hard to tell now.