Nothing is really fabricated just basically cut. You just take a 2.75 muffler clamp end and have someone plasma cut it .The best way is to make a template out of cardboard or similar material cut it to the shape of the muffler clamp. Then take the template and keep cutting and shaping till it fits snugly to the crossmember.Once you are satisfied that it is correct lay the muffler clamp on the template and trace the shape of your final measurements. Take it to someone that has a plasma cutter or something similar that can cut the shape and thats it.
The flat pieces I cut by hand but like I said it would be neater if a machine shop cut them.
Once it is cut the install time is probably 30min.