I want to spread out the load from the crossmember on to a larger section of the frame, rather than the 2 holes in the open section that was stock. This is the outer piece of angle that will weld to the crossmember. This is the inner piece, that will be captive inside the boxed frame. Here it is dummied up. I will weld nuts on the inside, as they won't be reachable. Welded it up, ready to paint and go in. Also cut out the frame boxing plates that will close in that section and provide strength.