I arrive a little late for the periscope colour filters question that Arclight posed some time ago, but if it's still of some help, I'd like to point out that german WW2 submarines had two exchangable colour filters in the oculars: Deep neutral and orange. Orange was used to allow looking at a target against sunset/sunrise, as the orange blocked the intense orange sun rays, while the deep neutral (Looking like fog, soft grey) was used specifically to eliminate the disturbing small light reflexes in the peak of the waves in bright sunny days.
As for moving torpedoes from the stern to the bow torpedo room, I have no idea if someone actually did it, but if I had to (And I find it highly impractical, since it's easier caluclating a solution for a stern shot than taking the pains of moving the torpedoes around
) I would do somethings more simple:
1.- Eject the torpedo from the stern torpedo tube into the water, ensuring it is set to float
2.- Tow it along the hull forward and
3.- Submerge the boat until the bow torpedo tube aligns with water level
4.- Push it backwards in
No really, I know this won't work in real life, but it feels cool to have found a solution
