On the two above ships'-of-the-line version with steam plants: why on earth do you use such antiquated stern galleries and ditto bow decorations? They look very, very odd to me, and not possessing the clean, sober, business-like lines of the later period (1820s to 1860s).
Have a look at real ship decorations. Look at different navies etc. You will find everything from clean shaped bows and sterns to those looking completely overloaded with decoration. If Alvama designed the ADU-ships this way it's ok. Remember, it's an AU! However, I like the early ships very much.