SoulTaker,

Let us be practical. Of course it is inefficient that millions of users all over the world recreate the same simple stuff over and over again, reinventing the wheel.

If you don't know how to retopology, or don't have the right tools, do like this,

1. Make your derivative, nobody is going to care about what you do in your own home.

2. When finished, maybe 70 % is your work and 30 % the orginator's.

3. Then replace the orginal mesh that is left with you own. It is easier to do 30 % than 100 %!

Also remember that there are millions of models in 3D warehouse that is completly free, even to sell and distribute.