If anyone is interested in working with md3 models in blender for import export, i made a little tutorial here:
Part 1: Installation and First Example
Part 2: Textures, Materials and Baking For Export
Just for documentation and i liked to Figure it might be useful as well.
If you have any comments on what you would like to see, or if something does not work, post it somewhere (here or on yt) so i can see what maybe wrong or can add more stuff which might be useful to know. I am doing some stuff in tags and animation in the future (no clue when).