you are going to put the tub back on? I'm just trying to figure your rationale on the cut and splice times 2 you are doing. What are you doing about the outward bend of the frame in the section where you cut? it looks like you cut out the gusseted piece of frame where it starts its outward bend, reasoning for the gusset.
I just cut mine at the rear frame crossmember. Buttweld ext, then gusset them. I can't see doing two buttwelds and the gusseting them both. I am trying to extend the frame without it looking like frame extensions....