I don't actually know the history, i do know the frame was modified a little by the previous owner, they put a bull bar and an overhead bar (similar to a roll cage, just no actual way it could hold if i rolled)
as far as axle replacements or tinkering, everything LOOKS original, welds are significantly nicer than the other modifications.
Im almost certain they are sandwiched though, tomorrow i can take much nicer photos, including the underneath.