Joe, yes, displaying these is an issue, which is why i think 2 of these big kits is enough. And i know that the GATO is even bigger than the U-Boats.
U-156 was the boat which sank the SS Laconia and so kicked off the Laconia incident. It was one of those events in WW2 when the Germans acted decently, and the Allies, lets just say, did not. Yet of course we hardly hear of it.