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Before the chassis could be boxed, all the holes in the 'rails were plug welded. I cleaned the inner surface of each one using either a die grinder or a file, depending on the size of the hole. If you want to weld caged nuts under the body mounting holes, this is the time to do it, as once the boxing plates are installed there'll be no access. I elected to leave the body mounting holes open for now, as I don't know where my body mounts will be, but welded every other hole closed.