You're on the same wavelength as I am. How strong does it need to be & that's a good question.
On most vehicles, the sole job of the transmission x-member is to hold up the rear of the drivetrain within the chassis.
On other cars, people are tightening up the chassis via boxing & additional bracing (bolt-on + welded pieces). These cars are potentially using the x-member as yet another tie-in point to help stiffen the chassis.
And then, there's people like yourself utilizing the trans x-member as not only a device solidifying the chassis & locating the rear of the drivetrain, but also as a suspension mount/locating point.
This lightened x-member is def strong enough for the first two listed options. For a multi-purpose use application? It would likely work well if tied in further (within the chassis rails); something that a purpose built x-member would also be.
