1.The "Blücher disinformation" collateral victim:
A few month after the armored cruiser Rurik II was laid down in Barrow-in-Furness Vickers navy yards, work on two turbine driven domestically built sisterships started in New Admiralty Shipyard, Saint Petersburg. Focused on misleading the german designers, the british admiralty chose to keep there russian allies out of the secret surounding the data of what would became The first battlecruiser .
In august 1906, when the real caracteristics of the upcomming Invincible were known, the first russian derivative was already laid down and half the way from launching. This was far to much advanced to simply stop work on the now totally obsolecent ship. Althougt laid down too, the second ship was less advanced but significative amount of material was already stockpilled for it (including one main turrets , two secondery ones, and the complete powerplant).
To increase the effectiweness of the ship and make as much as possible good use af the available material, a new section was added between the powerplant and the rear turret to add a third one, raising its lenght to 175m. To avoid firecontrol flaws the seconderies turrets were suppressed. The remaining 203 mm turrets and powerplant were to be used in new ships derivated from the ongoing cruiser design studies : the Vladimir Monomakh class.
The new design was a category on his own being refered some time as semi-armored-cruiser others as semi-battlecruiser. Altought being lightly armed compared to pure battlecruisers, it was a good and fast ship.
The Vityaz' was the flagship of the new "Bystryy Pervyy Divizion Korabley" (First Fast division) also nikenamed "Turbinnyy Divizion" , constituted by the new cruisers. This units became a feared and famed unit in the baltic sea, arasing convoys between Germany and Sweden and laying offensive minefields. He was one of the most busy russian ship before and during the war. Plans were to keep him in active duty until true battlecruisers would be able to relieve it. But this never occured, so he never underwent a deep modernisation.
Being among the ships who were able to escape in the Ice Cruise of the Baltic Fleet, he was laid up in 1918 for lack of manpower and not recommissioned until 1924, by which time he had been renamed Afanasy Nikolayevich Matushenko (the sailor who leaded the Potemkine mutiny).
Despite unrealistic plans to rearm it with two triple 305 mm turrets from the damaged battleship Frunze (former Poltava), making it a true battlecruiser, were shelved, he underwent sevral modernizations. First, from 1929 to 1932, boilers were rebuilt for burning oil, clipper bow was built, fore mast was rebuilt, two fore funnels were merged. Then, Just before the outbreak of world war two, from 1938 to 1940 superstructure were again reworked and extended and main guns elevation was increased. In this guise he entered world war II with the rest of soviet navy.
A word about the sources and design:
I was projecting to draw a "Baltische" version of the russian armored cruiser Rurik II. Garlicdesign wonderful drawing of it gave me the perfect base to do so.
On this occasion, doing some additional research, i've discovered that russians had planned to build two turbine driven sisterships before the advent of battlecruiser.
In my alternate universe lots of world war two russians foes had a signicant increase of their fleets, so that was a long time i felt the need to beef up soviet navy.
I limited myself to add a single aft main turrets, therefor only one section would be needed. The secondary ones were suppressed to avoid fire control issue and reduce the displacement (maybe i should raise the ship a bit to reflect that). This way i hope the ship could achieve at least the same speed as Invincible with 30.000 hp (estimated power of a turbine replacing Rurik II triple-expansion steam engines) with a similar lenght but reduced beam and draught.
Soviets rebuilt will follows and maybe the 305mm project.