Thanks guys, patrol/test it will be - My personal favorite too ...  
 
 Early boats had 2 rows of small square steel plates on the top part of the hull front and a wooden deck with a flimsy railing made out of 4 poles with rope/wire. later boats missed these features.
My referances is somewhat lacking on this feature, but my guess is, that the deck was removable and intended for work at the yard - fitting etc. and was removed on delivery. The purpose of the steel pieces was to fix/confine the deck sections, but that the deck was otherwise just loose, so that it would not be possible to dive without the deck comming loose.
Late the steel was seemingly removed - propably at delivery, which must have been annoying since it would require touching up primer and paint.
Does this make sense - any input ?
Since I called the blog "Probefahrt" I guess I have to ad at least the steelfitting, but I think I`ll throw in the wooden decksections to make it more interesting visually - even if I miss referances on the front part. Anyone have a picture showing how it was made around the front bitts?
Cheers/Jan