Thanks for the confirmation Pepper.
I like the look of it anyway.
I've been thinking about painting my U-711 white, with the slate or black camo swirls that show up in several pictures I have of her. The swirls are either dark, dark grey or black, no question. But in the B&W photos, it's hard to tell if the hull and CT are white or the typical U-boat Waffe light grey. Originally a friend had told me that no U-boats were white but I've since found (and confirmed from the people here) that many of the northern boats did have white topsides.
It does look right on your boat, and it gives the ability to emphasize the rivets and the smoke discolouration at the exhaust that might not show as well with a grey hull.