Please provide a template (hulls and modules) how you would set thm up and we'll add them to the guide.
This is a bit of a disingenuous response, as you've already noted that the slow engine modules aren't available in the vanilla game to get those British sloops in there without giving them even more ridiculous HP numbers than has been suggested for
Eritrea (which also has light cruiser battery one for the same armament as a British A class destroyer - effectively overstating
Eritrea's firepower by more than a factor of 2). The DD_4 hp (a similar tonnage to Eritrea, but built using more advanced techniques) is 60 - suggesting that
Eritrea's should be 40-50, but instead she's given a HP of 100.
The stats suggested in your post do not in any way represent a historically plausible description of
Eritrea's combat effectiveness - they more than double it.
Eritrea was a good ship (if you're keen on her, there's a great feature article in
Warship 2016, which gets into plenty of detail), but she had less combat effectiveness than an interwar destroyer, and was in no way, shape or form comparable in combat effectiveness to a light cruiser. It's also worth noting that while she was originally designed to have a seaplane, it was never embarked, so it's not entirely clear how effective her capacity to support aircraft was.
The last thing I want to do is to provide more ship templates that wildly distort the capabilities of ship's represented in the game, which is what I'd have to do (as has been done with Eritrea) if I was to provide suggestions.
Rodney's attack on Bismarck represents the first and only instance of a battleship successfully torpedoing another ship, and at that point the battle was already decided.
Going from memory (but I can look up as necessary), but there's some question mark over this attack.
The tech for the 38cm guns was available during the ship's construction phase but it was deliberately left out in favor of much faster firing 28,3cm guns with a top of the line ammo feeding system.
What effect should a smaller caibre with a higher cadence have? More, the same or less firepower? Should it have less piercing?
I'd say this is fairly straightforward. The net weight of metal and explosive than can be fired over a time period (when I've looked at it, I've used broadside throw weight/minute) is the firepower, and the armour-piercing capability of the shell the piercing. In terms of the ships in question, based on calcs I did for my naval mod, Renown/Repulse had a (very roughly - these figures should always be considered pretty rough) ten per cent advantage in firepower over the Scharnhorsts, and about a fifty per cent advantage in piercing.
he tech for the 38cm guns was available during the ship's construction phase but it was deliberately left out in favor of much faster firing 28,3cm guns with a top of the line ammo feeding system.
The story of the Scharnhorst's main armament is a lesson in why it's important to bed the design down
before starting construction! When the first was laid down, it was to a design with two triple 11-inch turrets, with a third added requiring the re-laying down of both ships (still with 283mm weaponry, although 330mm, 350mm and 380mm was considered), with an eye to possibly re-arming with larger-calibre guns down the track. According to Breyer* and Skwiot's
German Capital Ships of World War Two, one of the reasons the 350mm guns weren't in favour was because it would only be possible to store 130 rounds per gun at that calibre, compared with 150 rounds per gun of the 280mm shells/propellant. However, there were also issues of writing off 11 million RM spent to-date on developing the 283mm guns and their triple turrets. Ie, it was a combination of technical, political and financial reasons why they went ahead with 283mm weapons, and during the design stage, it sounds like 330mm and 350mm guns were stronger contenders than 380mm. From the sources I've read, the impression I get is that it was preferred to get heavier armament on the ships, but sunk costs and trade-offs in lower ammunition stowage/time to build meant that the 283mm guns got the nod.
* Siegfried Breyer is one of the best authorities on German capital ships I'm aware of, so I consider this a strong source.
Still, the Allies of course lost much more tonnage in warships to the kriegsmarine than they inflicted on them.
This is one of the many "slanted statistics" when looking at the KM in WW2 that's often brought up, and is very misleading - the KM's losses often only count surface vessels, whereas the vast majority of the KM's build (and combat) efforts were in subs (while the Allies effort was much more in surface vessels). Adding the hundreds of thousands of tonnage of submarines lost during WW2 changes the picture substantially (but I'm not sure which side ends up on top in terms of tonnage lost, I can't recall that off the top of my head).