Cleaned up all available metal with a flap disc on grinder. Cut down the cab corner a bit. Did a test fit. Still need to cut more off cab corner to fit the top up and behind the factory cab metal. Hopefully this answers Chuck's questions on how they go together. May end up adding some metal on the backside and up front. Easy to see why these rust out so bad. Once welded/glued we will need to POR15 and undercoat the crap out of it.