OP, let me make it simple for you. There will be no "mod maker" because there would be 1000's of random useless mods posted everyday that will be flamed and banned. There would be too much limitation...
Get your lazy ass on google.
Search "how to script in torque" or whatever the hell you want
buy a program to model... (milkshape, blender, etc)
ask for help in modification help thread.
close?