how do you add a profile picture like when you post somthing a picture by your info on the side showing your name
Based on Wikipedia (and a Google reverse images search) I'd say Colossus. http://en.wikipedia.org/wiki/HMS_Colossus_%281882%29
I suspect it would be difficult to get enough depression for the opposite turret to hit at the waterline, but I haven't measured it.
I suspect you are right. Those guns were awfully close to the deck to judge from the photos I've seen.