I don't know if it has been covered, regarding the Swedish Battle cruisers that are shown in game, the three Sverige-class ships. These were basically the second generation of the Coastal defence ships (all the older ships being slow armoured heavy cruisers in game). Armoured and armed enough to be comparable to one half battleships, each carrying 2x2 280mm cannons as main armament, 200mm armour and 20knts speed, weighing in at some 7000 tons, so considerably smaller tonnage than even heavy cruisers, while armed and armoured heavy to be more than a match for any heavy cruiser, unless they manage to score torpedo hits.
Their were to be employed as a means to force any invading fleet to commit it's heavies units, and such risk them in the extremely cramped waters of the Swedish coast/archipelago, where the navy had an extensive network of "secret routes", that detailed hazardous passages with a margin of error ranging in the odd metres, through which no sane commander would follow. The navy trained a lot to be able to use these routes at relatively high speed even in bad weather or darkness. Any heavy battleship in these waters would be a sitting duck to torpedo boats, submarines or mined straights, of which the navy had plenty.
As a side note, these ships were modified to fire at extreme ranges with a more accurate and aerodynamically shaped shells, firing 24km with a destroyer or small patrol boat acting as spotter. This enabled them to function as mobile coastal fortifications.
Also, in contrast to earlier coastal defence ships, these were designed to be able to operate on the open sea, if the tactical situation deemed it possible. Only the lead ship, the HMS Sverige retained the ramminb prow, without the ram attatched, while the other, Gustav V and Drottning Victoria had ice-breaking prows.
There is a beautiful story behind their creation, how in the build up to WW1, people wanted the navy to commission another class of coastal defence ships. However, the newly elected government cancelled the project, deeming it too expensive. This caused protests and the private initiative to raise the required 13 million SEK for the ship, and in a few months time, the found could hand over 15 million SEK to Rikstagen (the swedish parlament), with the requirement that it be used for building the ship. This caused the fall of the government, and the new government proceeded to build the ship, naming it Sverige ('Sweden' in swedish) in honour of the people who founded the ship. As the WW1 broke out, two more ships were comissioned.