Boxing of my frame

I am interested in boxing the frame of my 2a and would like any and all suggestions you could give. I am going to change out my axles with a narrowed 44 front and full floating 44 in the rear with wrangler springs mounted spring over. While I am involved in new spring purchases I felt it would be a good time to box the frame. I will need to extend the front frame rails to move my power steering box forward for the new steering and spring purchases. Should I completely box the entire frame? What is recommened for strengthening around the spring purchases? Thanks for the help