I was going to say the same thing as barge lol. Some tube stubs over the bolt heads and build off that
Copy I was thinking the same thing. And yes the stub tubes on the upper arm tabs will be boxed with .125 plateA. And box those to the frame.
B and C both tie the bumper into the cage in a wierd way. Smacking the bumper on the ground could be bad with the loads transmitted straight into the cage.