How do I fix this.

Today I started with taking some measurements and a doodle.
The repair that needs to be done on the driver side is extensive.

 So I gave it a good thought and then started cutting and drilling all the bad parts away.
And this is what it is. A good portion of the frame is cut away. 

 Now we can start by making some new frame rail and fitting it in place and then welding it all together. And then start all over again on the passenger side.
The driver side is the worst.