Hello Uwe,
Thank you for you kind comments. The coppering on the hull is nothing special. It's just one way of doing it. The copper plates are cut from self-adhesive copper foil which comes in a roll. The strip is 6.35mm (1.4") wide and if I remember correctly I believe I cut the plates 5/8" long. This is a Model Shipways kit and it includes one roll of the copper foil. If more is needed it's readily available from hobby or craft suppliers. It's more typically used by people making stained glass ornaments. They wrap the edges of the glass with the foil, then solder the pieces together imitating the lead cane that would be between the pieces in real stained glass work.
It's possible to suggest rivet heads by imprinting the foil using a pounce wheel (below)
I never know whether to include this step or not. I'm not convinced that at this scale the rivet heads should show up, so I always have an internal debate. The pounce wheel impresses the foil deeply and I'm pretty sure that it would be overkill to imprint the entire plate. So, the compromise is to outline the plate, running the wheel only along the edges. Since the plates overlap about 1/32" I only outline two edges on each plate. While this isn't exactly an accurate representation, it does add some texture to the finished product, makes the individual plates stand out a bit and the overall effect is not too bad.
The other question that is often discussed is whether plates should be shiny or patinated. I don't worry about this very much one way or the other. I just put the plates on, leave them shiny and left them naturally dull slightly over time. I notice that many of us (myself included) don't tend to artificially "age" our models, showing much wear and tear the way railroad modellers often do, so I don't see why copper plating needs be shown in an aged state if the rest of the ship looks new. On the other hand, a patinated finish looks pretty nice too, so I don't think it's too big an issue one way or the other.
You put the plates on just as you would if you had used the individual plates like some kits include or can be purchased separately.
Here are pictures of a couple of my other models during the coppering process and the last picture is my CWM with the copper finished.
I trust that answers your question. I am no expert on this subject, but that's just my experience with coppering.
Thanks,
David