Gorgeous model, Krzysiek.
As for the missing element, I do not enter into markings, I focus on the structural bits, I spent 15 minutes studying your model and the only thing I found missing are those tiny fancy hooks hanging down from the exhaust pipes under their fronts (some kind of drainage pipe, I am not sure). In other words I want to stress that if this is indeed OOB model it is a spectacularly detailed kit.