Good pic.

Now all I need is a wood plank texture for the Type IXs. I think I do have the slotted wood painted grey deck of the IX currently active. Didn't know that they have the plank decks also.

505s planks are teak
 

I've seen them and 995s as well. The difference between the "slotted" looking decks on the early VII A, Bs and early Cs, and the later plank construction was due to simplicuity and time consumption, became imparative later in the war. The wood was pieced between the planks at the cross brace running abeam between the port and stbd gunnel bulkheads at each section of the boat. The typ XXI had teak planking, but not much deck space. Not much to do outside on one of those boats to require no slip decking and below deck storage. I've checked out the two wrecks of U 2008 and U 2513 and not much left on the decks of eithe one. They were brought back from Germany after the war and saw service with the USN , untill they were no longer useful, then they were sunk not to far from my house.