A couple of points:
- Keep in mind the names of the models in the tech slots are to fit a tech tree that's the same for each nation. Everyone has a BB slot at 1922, 1936, 1940 and 1944, and the game needs BB names to put in each. I agree Scharnhorst is probably a bit late in 1936 were the tech tree a model for the production timeline, but it's not. By all means, suggest better alternatives for the names in those slots

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- I personally agree ship build times as they are, are unrealistically quick. As the UK starts with more naval dockyards than Germany or Japan, this is hardly an advantage to the Axis (quite the opposite), and once the US comes online, it's an even greater problem. As is often the case, you get better gameplay with more plausible ship build times, but I think we'll have to see this play out in practice (ie, Japan get done over badly) before it's sorted. I'm planning to mod the naval side of my game anyways, so as long as I can change the max dockyards for a ship, then it should be fine. I wouldn't sweat it, unless you're planning to play Japan much. If you're planning to play Japan, though, whatever you do, don't get in a war with the US

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This be true, but don't forget the UK starts with more dockyards than Germany, and a far, far larger fleet (and better access to oil). Even with the new ship build times, if the UK responds to German shipbuilding (and if they don't, then we've got a substantial AI issue), then Germany still won't be able to pull off a Sealion, and will also be unable to stand up to France's army. Germany's chance for Sealion is through airpower or diplomatically getting other naval powers on board - there's no plausible way (short of giving us rubbish AI, which I doubt any of us want) of giving Germany a short at matching the RN in a game starting in 1936, even with the crazy ship build times we've got.
Strategically, assuming things pan out diplomatically as they did historically, the main strategic result of faster ship times is to make life far harder for Japan, and the Battle of the Atlantic easier to win for the Allies. Given the Allies already start with a strategic advantage, faster ship build times are hardly better for balance.