Looking at it more I was thinking you should run that lower bar clear to the front of the car and bolt it to the front cross member. It'd add a couple pounds but it would be a hell of a lot stronger. You'd also have the option of replacing the front cross member with a tubular piece and making the whole front sub frame one solid unit.
EDIT: Sort of like post 51 in
this thread only welded in the front and using tube steel instead of the heim joint design.