The Tin-pervious Crocodile (sorry about the cheesy name!) is a water monitor (or narrowboat) powered by the tried and trusted Mssrs Higgs &Bovey Ol' Singer combi boiler.
She is covered in a variety of plates ranging from iron to tin, giving her a distictly patchy look (in all honesty, I don't have enough of the same colour grey or bley to make it uniform but the patchiness works well, I think)and is armed with two side mounted 30mm repeater guns, two rear mounted repeater bolt throwers, a roof mounted swivel mortar and a forward facing blunderbuss - captains perogative!
She rides low in the water and the twin props run on a redundant screw basis keeping the noise of their revolutions to a minimum.
The Tin-pervious Crocodile is used primarily for patrolling waterways and canals but in times of war, they can be issued into battle with an augmented front 600 calibre siege mortar to take out large coastal or sea going targets.
The ship is excellent. I especially like how you used one of those weird octagonal pieces to make the ship's wheel in the front. My only advice would be to work on the pilot minifig. His bicorn is on sideways, and the Aquaraiders torso doesn't look quite right to me. You should try using torsos from the Adventurers theme.
I like this a lot! I love steampunk and it's good to see something "streamlined", a lot of steampunk tends to be too bulky. It wouldn't look out of place in a "Flash Gordon" setting either, or am I just showing my age?
Keep it up-great stuff!!