Photos Sub Frame Connectors

I have a 20'+ stick of 2"x3" tubing that I was going to make frame connectors out of and your pics (blue missile) there just gave me an idea. Instead of welding the pan to the tubing, I'm going to prep the floor pan and then use some structural panel bond in between where they are close enough to touch. No welding on the floor pan means not having to mess with the already applied sound deadener on the inside.

Blue missile, what did you make those "mid span" supports out of?? 1/8" mild steel???