the only other true navy of the time would have to be the Ottomans Empire aka Turkey + ?  and just about any other nation with a navy was only Coastal out side of are current nations already existing list.

They already have one. It should be the Neutral Nation. It is in the game right now. All they have to do is create ships that are not in the game at present. Argentina, Autralia, China, etc. Of course they can create ships in the upper tier as needed based off what ever info is put there.

heyho!

argentina (agincourt), brasil, spain, (austria) had some older BB from ww1 era / (in WW1)

turkey as mentioned above old german goeben from ww1 (BC), BB Erin confiscated from UK in WW1

spain cv after ww2 (EX US )

netherlands in war some nice ddd/cl/ca and good subs as i remember

sweden coastal BB ...

maybe combine al this nations in neutral nation?

SS line NL, cv spain..., BB arg, ...etc

higher tiers will be fantasy, as most nations ingame today, too

It makes no sense to introduce the game of a small country. What will the Romanian destroyer or the Dutch cruiser give us?

Dutch navy is the only real option becaue they had submarines, destroyers, cruisers and (designs for) battleships.

Famously known for having the only submarine fleet really capable of interering with the Japanese in the early stages of the war... Until the USA got their torpedoes fixed at least.

Here's a National overview:

Netherlands Strengths:
-Submarines
-Single Barrel Gun speciality

Netherlands Weaknesses:

-No high tier battleships
-No Triple Turrets

Lets split it up into era's; WW1, Interwar, and WW2. I have a good source for Interwar and WW2, so let me just go over the WW1 ships fast and why they aren't useful in navyfield.

WW1, these would be the respective early (DD1, CL1, etc) ships:

• Destroyers:

Wolf-Class (1910)

This class arguably counts as a frigate to be honest. 4 small guns and 2 torpedo tubes. Meant to serve in the east indies. Tiny

• Cruisers:

CL1 Holland-Class (1898)

 This armored cruiser had a mixture of guns and 2 torpedo tubes. Tanky, but the firepower was lacking with its 15 cm guns. Only 2 viable guns!

• "Battleships":

Koningin Regentes (1898)

Koningin Regentes was an armored coastal battleship with two 240mm guns that was only 100 meters long. Tiny, again only 2 guns

De Zeven Provinciën (1909)

De Zeven Provincien was a cruiser sized coastal defense battleship with 2  280mm guns. not much better.

• Submarines:

These tiny WW1 submarines can probably be skipped, or only the K I used.

O2

With only 2 torpedo tubes this 30 meter Submarine is tiny, but promising.

K I

With 3 torpedo tubes this Submarine is a little bigger then its predecessor.

Pretty much all of these ships can be safely ignored, but lets use the 1909 zeven provincieen as our BB1. Then lets go with this:

That should account for DD1, 2 and 3. CL 1, 2 and 3, as well as SS 1, 2 3 and 4.

Project 1940 accounts for BC/BB 2 or 3.

There's also the Dutch 1913 battleship proposal armoed with 8 14 inch guns, that'd give us at least BB 1-2-3

I believe no other nation that doesn't already have representation in Navyfield can have a more viable fleet then this.

Here's some more fun information:

http://www.naval-encyclopedia.com/ww2/netherlands/dutch-navy-ww2/