Thanks!
As for your questions, I pie cut the uppers so the ball joint would not bind, and I notched the drivers side upper arm so it would clear the the steering column. When I notched it, I reinforced the notched area with a half piece of pipe.
I did not have to modify the firewall at all. Keep it mind, this is not power steering... just manual.
I don't see any need for reinforcing them anymore. They feel pretty strong to me.
Here is a picture of the bag compressed