No to Skyrim, Bannerlord, or any other game. A few reasons:
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Skyrim is modded to death, it’s an old game with entirely different mechanics. KC:D was chosen because it’s realistic, looks better, plays better, is built with newer technology, and comes from a supportive small studio with high responsiveness to the community.
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Your idea of what’s possible / not possible with modding seems to be based on a handful of forum threads, mostly by people that haven’t dug into the game data in any sort of detail (no offense – join the Discord server and simply compare the discussion quality and productivity there).
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Seven Kingdoms is an existing project with 2 years of successful releases for a different game (Total War series), one with a number of larger barriers to mod production. Good games attract good communities, and good communities navigate around these barriers with a little time and effort; for example the Attila community programmed many of its own tools instead of relying on AAA developers who’d rather crank out another title than support their base.
My suggestion is to download the CryEngine SDK and crack open the game data. Everything the project needs to be successful is within the realm of possibility.