Kammler can be linked to every fantastic and most absurd idea on nazi secret projects. However there is a caveat - till now I have never seen his name in any document that can be surely sourced to any atomic project nazis may have had. None, zero, nada, nechego...
The most striking fact that Kammler had nothing to do with nukes is how real nazi nuked scientists tried to survive the last days of the Third Reich. Most interesting was how Heisenberg managed to find food and other essential things for his family - he got help from an old acquaintance working at one of Kammler's key labs! For that, he came to town on a bycicle and the acquaintance was shocked by his shabby looks. So Heisenberg was a lost soul at the end of the war.
Nukes and Kammler, until someone proves the contrary, don't cope. However, this does not mean someone may still find some mega-leftovers of Kammler's Underground Empire. For the sake of what? Well he surely was an early participant of "Amerika Bomber" project, still in a very classical form. He also was the V-2/A-4 boss and there are tons of questions on how deep was his knowledge and participation of such projects like the A-10. He once worked at Luftwaffe and seemed to have been in good relations with Goering, so he could know about such wonders as the Silbervogel. And, at the end he was the last boss of the nazi jet projects (which was the reason why von Braun suddenly stopped at Oberammergau, with this guy breathing at his back). While war demanded some humbleness, it was usual to see many nazi projects exploding into mega-machines. I wouldn't be shocked to see the last of the last of Kammler's projects, the Messerschmidt P.1101, having a megabrother nearby. Or maybe it was just for the P.1101 itself! Once tested, they had to be produced somewhere, in large numbers, in very, very large numbers.
So the huge, nearly empty bunkers. Maybe for one of these bloated conceptions of World Domination. And nukes were just speculation, still without any proof of concept. At the end of the War, nazis still thought that the key to victory was the Very Big, Surely Bad and Really Ugly.