Advance dupe a map prop

So I am starting on a scale battleship build but what is bugging the hell out of me is I want this cannon from gm_flatgrass_V2 but Its a idk how you would call it, a map prop? contraption? I can move it around with my physgun and can not dupe all 3 moving parts at the same time only 1 individual. Normaly I would just take barrels and stuff them in a tube with TNT but I want to do something right for once :P. One thing I can do is dupe and save 1 at a time but they have a door/breach on the back of the cannon which I wouldn’t know how to set up on my own. Can someone help me out or take a look at the map and tell me what you think?
Thanks.