This is a reasonable solution, but I have a couple comments. If both ends of the curved tube have a direct path to the chassis than it would be OK. If you are only welding to the pan than this is not a good idea. Not just with what you are doing, but any cage should never be welded to just the pan. Also, the cross bar is a good idea. You may also want to try to triangulate this area under the tray. Right angles do not provide good lateral stability. JMO. Good luck with a great project.
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