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[*]For no.1 There's only been one proper engagement in the manga that involved mental models... Essentially expect barrier based combat and local gravity shift shenanigans... However the ship/character is still able to utilize the equipment present on their ship body... So for example the ship body might be out on the harbor and situation dictates the need for offshore bombardment support on the Mental Model's position then that's perfectly within their capabilities...

[*]For no.2 That's the part that you solve by hiding the ships... Because if anything the 80 or so chapters of the manga has shown, is that the FOG vessels are extremely good at hiding, submarine or not...


[*]And as for the last part... I'm just not entirely sure how the things in Kancolle work in general I mean paper talismans turning into miniature warplanes complete with pilots, I'd chuck that one as magic but I don't know if it is canonically actually magic... Yes I should be able to roleplay them fine since I have made fanfics for it but what I'm worried about is that I might portray how things work in a completely inaccurate manner...
If you're fine with it being slightly AU then yes Kancolle is a second choice...
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[hr][@PaulHaynek]