Hi all ~ There are several deck surfaces on KM ships, not only Bismarck, and they varied in colour. The main deck and maybe parts of the first superstructure deck (level 01 in US terms) normally was planked with teak. Then, you have the bare steel deck, painted in a dark grey matching RAL 7016 (btw, the same shade that was used for the boot topping). Then, taken Bismarck as an example, you had CRATED and SLATTED wooden panels on the RAL 7016 steel deck. The crated could be found on the open bridges and are said to have been brown in colour (when new and not yet faded, I think Revell's #80 or Humbrol's #62 (Leather) can be fairly good representations). The slatted panels are said to have been in a beige-ish colour, such as Revell's #314 or Humbrol's #71). The slatted panels were besides the Admiral's Bridge (maybe around the smaller rangefinders), on the foretop gallery and maybe some other places, can't remember them all now.
At least, these are the colours I used on my 1/700 PG model, please have a look here, the overall snap half-way down the page.http://marinewerft.foren-city.de/topic,101,90,-tamiya-1-700-prinz-eugen-update-25-09-09.html
The main deck and parts of the 01 deck in teak, open bridge area in brown crated panels (from the wonderful Flyhawk PE set), the roof of the structure behind the fwd armored conning tower has received the colour for the slatted covers (beige), as well as the small Flak platform on the front of the conning tower and the deck of the foretop gallery. Note the difference between the beige and the 'teak' of the main deck.
Please note that on Bismarck the deck arrangement was different ...
Happy painting ~ Olaf!