Tack the chassis together,fit and weld brackets on,fully weld everything and then etch and paint.It has beeen discussed here and even after years of use the internals are as good as nearly new with little rust inside the rails as there will be little air and and moisture left inside after welding.
You could squirt Waxoyl or something like it inside if you feel the need and I personally will do this before capping the ends.
Good luck.
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