You can. Check out the plate bumper from 4x innovations, theirs is bolted onto the existing brackets.
Be sure to post some pictures when you start building it, I love seeing what kind of designs people come up with.
x2, Completely bolt on. If you search you can find several pictures I posted of my 4xinnovations plate bumperYou can. Check out the plate bumper from 4x innovations, theirs is bolted onto the existing brackets.