Ikar,
I have used Flyhawk PE and hopefully will be able to help you. Usually, the Blue diagrams are for the P.E. part itself and the Red shows how it should look when finished. The photos show how it should look In place.
That being said, Flyhawk instructions are no where near as clear as Eduard’s are by a long shot. So, why do I use them? Well, I love how much they pack into a set for one thing. Another is that they include resin and brass parts too.
What are the drawbacks? Well, as you have noticed they are not always clear and they do not include all the parts in their instruction! So I usually do as much research as possible to figure out where missing pieces from the instructions go. I also use Kagero’s 3D books but please realize that they are not always correct either.
Hopefully this helps some but if not, please ask and I’ll do my best to answer your questions.
Steve