I agree....I would seek a second opinion. the front rails are NOT perfectly straight brand new.
plus...it would be easier (my opinion) to staighten frame rails than remove / replace. I spent a whole day lining up panels....it is not a simple task...especially for frame guys.
IF the frame rails were bent....you should be able to see sheet metal bent....do you see any deflection on the inner fender panels. Is there signs of collision damage?
