Thanks a lot!!! Many question, let's see...
I have some doubts about some of your ships. I have no time now to go in dept, but here are a few pointers
- your very first ship has 2 engines (most likely gas turbines, judging from up and intakes) but 4 propellers. I have not yet seen this fit, can you explain how and why?
The only one with 4 is the CVN that is Nuclear/Steam as the US carriers, the others are mostly CODLAG with bow thruster or Azimuth for the smal manuovers.
- why all the different design lines? I see a lot of italian stuff, which I can understand, but also US ships, at least one french ship and scandinavian influences, if I saw it correct in a quick glance
Well, Italian cause i'm italian... the US ships, cause I like it and is difficult to find something like that in Italy, the Franch one is the same, before i was using Italian ships, but that one fits perfect for a radar/spay ship, is more discrete... My LPD is based on the spanish/dutch LPD, the smal units ar mostly from Danmark cause I prefer their module system for fit many roles.
My country try to take the best wherever it come from, but as the US using National systems and equipments
- may I point at the latest parts, especially the Mk 13 but also the RAM, marlin (the 25 mm is in reality just another gun in the same mount as the 30mm) and I don't really know if I like your OTO 76 Dart mounting.
The Marlin is in 2 versions, the 30mm is the real one fitting 30mm ammo for standard with the other chain gun, the 25mm is a gatling gun as un the Mangusta solving the role of the Phalanx, Oto-Melare showed it few months ago in an Army fair in Rome as a land C-RAM system... For the 76 Dart, well i really don't like the original one so trying to find an other version came out this one that i like a lot... 
- you seem to have large diameter torpedo's coming out of the same tubes as small diameter ones, why and how?
No no that one is a mistake in part sheet... the small ones are gust for the ship tubes and the helicopters.
- more an question, but what do the green and red blocks and lines represent on your parts sheet?
That is for remember me the one in use the old/retired ones...
- why the love for shrouded propellers?
In my mind that is for reduce the cavitation of the water as a Fenestron...
I complement you though, on the fact that none of your ships seem really overweight or badly loaded, but this of course is partially because you used real ships as base. still, good effort, but I would love to see some more of your own design work into it
as that is what I like the most about the AU designers here. some background stories on the ships would be nice too, the most interesting thing about ships is the why you have designed that way or chosen those systems.
This a big work in progress... 
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