Gunboat weapons on battleships

[Nightfall]

Is it in any way possible to restrict mounting of out-of-class equipment on any ship?
Also, ONE fighter should NOT be able to pwn a battleship on it's own (even if it be Dab piloting it [not going at you Dab, but be realistic])... and I don't want to go repeating it all since it was said a million times - a lower class ship should not be able to take a higher class ship on it's own.
Can it be done like make class A (11) for gunboats, class B (12) for cruisers and class C (13) for battleships or something? possibly not as someone would have already made it, but I had to ask.

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If the stars should appear one night in a thousand years, how would men believe and adore and preserve for many generations the remembrance of the city of God? - from 'Nightfall' by I. Asimov
The Outcasts consider Siniestre Nube a sacred place for several reasons. Early explorers discovered a jumphole within the depths of the cloud that leads to a strange world of ringed stars and strange craft. All ships in the burrial ground are placed facing that hole to honor the Alien Spirits. - An Outcast rumor