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The real cannons caliber was 18", this One looks to be roughly 80cm in diameter so about twice the real gun. I put it in my Titan Ground Support ship, it took up the entire docking bay, roughly 16m across. so I then shrunk it and it didn't take up as much but it still looked menacing.I sent all 3 prefabs away to Micah, you might see them put into the game otherwise Ill just put a separate download into my shop
I would like to request some tubes, or pipes. Actually more tubes and hoses. You should be able to place them alongside normal blocks. There should be straight ones, and enough kinds of curved ones so that you can place them around corners.
This looks like the one already ingame a little. To make it different I would put some high techy stuff on it like glowing lines when you do the texture.