Don't want to make too little of the "Giant", just pointing out that it was no remarkable feat in the terms of engineering. The engines were put on for it was too heavy for hauling easily, and even with the six of them, it was still a slow hauler.
It cannot be taken from it however, that the U/C was excellent, and the nose-unloading extremely cool.
(I used to work for Cargolux, loading and unloading 747's that had an opening nose and the side as well!!!, - but that was in the 1990's and they carried 100 tonnes)
So, I cross my fingers in hope that one of those could be rebuilt and put on display. The one on the seabed might be a good candidate