The bracket will be the same height as the stock one.
I thought about boxing in the front also, but talked to several people who have this set up and none did it and all were still in use so not necessary. I keep thinking I will go back and box it in just for looks but it has been several years and I just never got around to it.
Truth is , It works fine as designed.....
I don't think you will screw it up.....I did it and I am no welder......This is not like welding frame sections together.....clean work area , good ground , make short passes , don't try to run one bead all the way around. If it doesn't please you, grind it down and run another bead. Its about penetration and consistent speed.