This is thie kind of thing the neostandard was designed for. You'll find a lot of shipsets these days come with "spare" images for modders to use - for example fightermhuge, fightermassive, troophuge, troopinfantry. Those shipsets that lack the extra images can be directed to an alternative image, or they can use the generic ones.
Neo-standard ship set compatiblity list is way out of date though.
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Creator of the Star Trek Mod - AST Mod - 78 Ship Sets - Conquest Mod - Atrocities Star Wars Mod - Galaxy Reborn Mod - and Subterfuge Mod.