Middle section of the Inner pressure hull.
Its made out of resin, and support is needed. Few styrene profiles were added between the fixing points to prevent it from sinking.
The 88mm gun mount.
Couple of pictures taken from the book U-Boott VII vol 1 by Marek Krzysztalowicz.
Resin part by White Ensign Models is about the half the hight required.
It is also of the wrong shape, as it only has single fins on the front and back.
I have sanded it flush with the pressure hull, and made the new one with styrene.
The most important thing is - the opening in the deck lines up with the mount nicely now.
TBC...