I seem to remember that the main spar is lifed (can't rmember the figure) but once you reach the limit, the A/C is basically scrap.
I did my 1st lesson in a pa38 and enjoyed it - but one of the instructors pointed out that a full fuel load, myself and the CFI would not be able to leave terra firma. I continued my training on pa28's and love them to bits; spam-cans maybe, but about as much fun as i've had with my clothes on.