The large "v" on the sills are advised to flip to the opposite direction for impact precautions. Since you have not welded them in yet, you may want to flip them. I have not gotten there yet, as mine are fully welded in with the middle brace as you have. I will likely cut them out and re-weld when I get farther with my revisions.
I have not done enough research on that section to know if it is really required, but iI can see the danger if the car is T- Boned.
I have not done enough research on that section to know if it is really required, but iI can see the danger if the car is T- Boned.