For the back arches, have a look for one of garys threads on a car he has tubbed. Cut out the arch around where it starts to curve to the 1/4 to ensure you dont cut too much out. Then split the tub down the middle joint, drill out the spot welds if you have the patience! Then come out from the middle square to the tub and mark the 1/4 at that point, cut that line out and then get yourself some flat sheet steel, curve it so it follows the shape of the tub and your cut on the 1/4 then weld it in and trim it off and youll have a perfect solid outer tub
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