Oh that looks fun

very tempted.just let me finish my current Tutorial.
Just need a bit more info .How big do you actually want this/how bigger a model can you store?(as to scale is roughly 5mm to 1ft).How much do you intend to invest into the project.(time vs money).
As a project they don't come much easier as its very simple cubes for the most part.The only draw back is size.As for deck guns you can do all that for nothing or buy them if the budget allows.I've a picture of a zero cost 35cm boat in my traction engine tutorial(I know a bit odd but it went a little off topic for a while)
Mark.