Currently have a game based loosely on an alternate WWI where Germany, Britain, and America are the only worthwhile powers remaining by 1920, when TN tech is researched. All three are a regular 500m population transnewtonian start with no research points or ships. The whole thing is an experiment on having three earth based powers use the railgun battleship doctrine, so the poor backstory isn't an issue for me.
Germany launched the first survey ship in late 1920/early 1921, followed by three American survey ships and two British survey cruisers (which are armed with 4 10cm railguns). Britain built the first two warships, 9,000 ton cruisers armed with 12 10cm railguns, followed by America with three 10,000 ton warships, which have less weaponry but are faster. Germany is waiting until nuclear pulse engines and better railguns to design their first warship.
I may post the designs later, after more time has passed.
EDIT: I had to restart, ran into some game-ending errors.