I cut out 2 crossmembers. One was the one I am picturing here that holds the driveshaft carrier bearing, the other was the bolt-on transmission crossmember with integrated mount. I believe I need to restore both of them. The former one was a bit further back as it was the rear support for the gas tank.

I think I will end up building a bolt-on one under the trans and a welded-in one that I have simulated here back about one inch for output shaft clearance. So I could pull the forward one for trans removal, and it would give me a skidplate mounting point.

For gas tank mounting I think I will build a 3rd mini crossmember for gas tank support.