New commercial mount for 2004R transmission
With that lower section closing it off, the torsion bar forces look to be well managed in the middle area and spread well there. (Assuming the material thickness is reasonable; it looks thicker than the original.) Transferring force to the angles per se will not be any issue if they are well welded ; you could have a piece welded at 90 degrees to the remaining portion of the crossmember and still transfer the force well. The t-bar forces are trying to pull the central section of the crossmember downward so the main loading on the floor will be on those angled sections; it might be better to have their sides spread wider, and flanged for a better weld to the floor. But at least their length helps spread that load along the floor.
That trans pan is going to catch hell! #-o