How to start making mods?

I'm a 3D artist. I make 3D models and sometimes I make map textures. I would like to create a mod that improves the models and their textures. With the current Saints Row 2 modding tools is it possible to import custom models into the game? If it IS possible then please post a link to a tutorial or something. Would be very much appreciated.
 
It's the file format. cmesh and such. I've looked about backporting sr3 and 4 tools to make them work but no luck so far.
 
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