Nobody wants to comment on the effectiveness of the floor bar?
It's pretty looking but like I said before, it only attaches in two points... If you just welded something like that to the floor all the way across, or at least connected it to the floor somewhere in the middle, I'm sure it would serve its purpose better. Pressure across the length of the bar can cause it to bend vertically or from front to back independantly of the floor, but if you add a little metal to prevent that motion it will take a lot more stress across the length. A box is no where near as rigid as a box with support going from corner to corner.
Besides that, does the car even need support there? The strut towers are an obvious place because there is little/nothing there to directly prevent those points from moving indepedantly, and there is a lot of stress around those points. The floor bar is barely seperated from the floor, which I would think is pretty strong across it's length already.