The bow casemate guns aren’t very clearly explained in the instructions. Some views show them closed up, with just the barrel showing:
The alternative option is open, but apparently without the blister or covers:
Only later is the open option revised to this:
I had a guess at this being right (although the slotted panel might have been intended to be flat to the hull:
I doubt the inside will be visible, but I painted it anyway:
Part 31/32m needs to be split into 4 parts for the open option, yet most of the cut lines are missing. I made a best guess, so hopefully it will be ok.
I’ll add the open doors later.