[Def]

Given that bending produced by the chassis trying to deflect the strut towers inward, like you get when cornering, is going to be proportional to the width of the cross member cubed - I'd say you took a ton of rigidity and strength out of it. Say the original crossmember was equivalent to a box that's 4" wide, now it looks like it's maybe equivalent to a box that's ~0.25" wide in the center. That means you now have 0.25^3/4^3 = 0.024% the stiffness in bending.

Even if you say all that extra gussetting on the bottom adds to the equivalent of a 0.5" thick box section in bending, you still only have .5^3/4^3 = 0.19% the bending stiffness.

There's a reason the OEM cross member is a large tubular structure. You can't just hack out huge parts of that and say it's good because you put some incomplete fusion MIG tacks on pieces of it.