Steering box frame repair

[Joey-D]

I eventually will be doing crossover steering, so there will be a lot less stress on the frame, but I was in there today and realized the frame had cracked before and the last guy had tried to weld together to fix it. Anyways it has cracked again. I need a frame repair kit but they are 65.00. I have a sheet of 10 ga plate. Could I cut that up and weld it in? Correctly weld the frame, weld in a inner piece and an outer piece? Does anyone have a diagram for the shape of it, or does it not have to be exactly like the pre manufactored ones? Any input would be appreciated. By the way, it is a 85 1/2 ton swb with 8 in lift and 38.5x15 on 3/4 axles.