Rewrite the origin story of Iron Man so that he is poor growing up.

Stark inherited a large American company called "Stark Industries" when his father died. He was badly injured by a bomb in an attack planned by people who did not like him running his company. Shrapnel from the explosion was moving toward his heart. This would have killed him, but a scientist called Yinsen who was with him made a magnet for his chest which would keep the shrapnel away.
When Stark's father died he was dirt poor so he joined the military. While in combat he was injured by a bomb that was thrown in his direction.  The shrapnel from the explosion was threatening to kill him by moving closer and closer toward his heart but a genius doctor that was at the military base created a magnet for his chest to keep the shrapnel away.