[storm9c1]

Me thinks that the seam is interesting too but I can't put my finger on it by the lack of detail in those pics. It almost looks to me that a whole floor pan section may have been welded in (which isn't unheard of on these trucks since I've seen many hollow-floored trucks laying to rest). If so, then perhaps the whole top section was cut at the firewall all the way around? Either way, that kind of work would have needed to be done BEFORE it was painted that orange color since it all matches now.