Our Cage Build (pic heavy)

[Larry Herman]

Hopefully you haven't fabricated those door bars yet, because they are completely worthless.  IMHO they are both heavier and weaker than a simple X brace.  They are fundamentally an unsupported trapizoid, and because of the double bends create an unstable complex of tubes that can easily be concaved on impact.

I have also seen plenty of cages that had "Nascar Bars" that were also worthless because they too had no strength in tension or compression.  Instead, you should consider making a gusseted X brace similar to what a Porsche 996/997 cup car has.  Straight tubes are stronger, and the pyrimidal shape offers significant strength in compression.  Of course YMMV.