That is a good question, I don't really know I just went with something I found aesthetically appealing and these weren't supposed to be necessarily 100% correct as i originally hadn't planned to post them, however Novice suggested I post them for the rest of you to see.
Posts:2493 Joined: May 15th, 2011, 5:10 am
Location: NE Tasmania
I believe what everyone's trying to suggest is that the height of the door base is suggestive of higher deck within as most ships on the bucket, have doors very close to/on deck level. Some ships doors are like yours, mainly maintainence doors and doors high enough to kept shipped water on the outside of the ship.
Posts:7496 Joined: July 28th, 2010, 12:25 pm
Location: the netherlands
note that in shipbuilding, doors are often placed higher. on seagoing ships, watertight doors that come out to the exterior, should be 60 centimeters above the deck. (the rules are somewhat more complex then that, but for the sake of simplicity, let's keep it at that)
interior decks are sometimes doubled or heightened to counter this problem, with some steps to reach the doors at the outside (as 60 cm is quite high to step over, 20-30 cm is kept as the max for that)
how this applies to these tugs is something different, in which I will not throw my head in, as that is up to the author. but there is something that can be said for high doors.
note, bulwarks are often between 50 and 100 cm high. the doors beginning at the top of the bulwarks is thus not that far of per definition.
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I see what your saying, with thease the base of the door is more or less in line with the edge of the bulwark similar to the tug in the photo below. That being said I think if any thing I would lower the Bulwark on thease tugs.