I would consider plating the whole side, bending a flange on each edge to give you a channel section so you can weld onto existing doublers. Then you can prep a bit harder before you weld as the metal is thicker, up the amps a bit and get a stronger weld. Before the final fit either remove the old section or take out some metal with a hole saw so when you finally inject some waxyoil it gets where needed.
yrs, Nick
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