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Can you specify a little better what kind of models you are referring to? I assume you don't want to model the models yourself, as then you have best control over polygons and attachpoints of course.
I never heard of that, I know there are some companies who are selling finished models for ESP. These usually contain LODs with different polygons counts and also different animations. But I never heard of somebody selling a tool or product that allows you to specify this on demand and then get the result.