Welcome to the Club! Lots of good info here and good people.
To answer your question about replacing frame rails. Search the vendors here for replacement rails and then drill out the spot welds and remove the old rails. Place new rails in place and weld from the top, where the drilled holes are placed. Then stitch weld the rails to the floor on the bottom to prevent warping of floor.
I believe Eastman sells aerosol protectant for the inside of the rail before it gets welded on. You might check their catalogue.
If you can't find preformed rails, you might have to make your own from 3/16" steel sheet or get some from a donor car.
Give a man a rescued dog for the health of both their souls. May 2017 ROTM Winner - Thank you!
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CUBS - 2016 World Series Champions - maybe this year, 2019 ...