Is this an OK way to reinforce a front sub-frame?

My plan is to replace the front subframe in my '67 Monaco with this one:



I'm showing here the underside rear passenger side. I would of course clean this frame up and paint it, but I want to go further.

I want to form this out of 3/16 plate steel:





And weld it to the frame:





Here's a shot of the driver-side rear:



The yellow circle is where I think a lift-support is usually placed. On this side, for...

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