Whats wrong with this torque arm?

It seems to me that something like this would be quiet and strong.
I'm aware that it is not much different from the TA relocation crossmember setup as that is what I am currently running. My problem with the relocation crossmembers is that they use the polyurethane block with a hole in it as a bushing and due to the large diameter torque arm tubing, there is little material on the sides and it transfers quite a bit of noise. Also Im not sure that it allows very good front to back movement. Furthermore... because of space restrictions, the torque arm is mounted do an awkward vertical plate which vibrates the tailshaft.
I am also aware that there are now 2 companies making tunnel mount torque arms which are also similar to this design... I dont like those because they well.. mount to the tunnel...
Whats wrong with what i've come up with?


