Your idea of not bad rust and mine is totally different, if you have rot through, you are looking at sever rust in a unibody, I have TJ and a YJ, full frames on both and the TJ is getting a few corrosion lumps but is still solid and same for the YJ. Its not a bad deal, but if you do the work yourself, its a full day to change the engine and get all of the accessories working. I have done several jeep engine swaps and they are just time and money, the hardest thing to do is get the bolts of the top of the tranny to block. They are a male torx and hard to reach. Everything electrical is plug and play. Tim