To my understanding, you can’t really do more than bring the parts together in a compact arrangement and keep them like that, so if the demon core would stay together (and not, say, get blown apart by the release of energy), then the issue would be a lack of fissile material (or reflectors), no?
See also an image of a nuclear bomb design (I think Little Boy) from Wikipedia, which illustrates the idea of sliding a rod of fissile material into a hollow cylinder, though the bomb did it in reverse. I think the design might be obsolete due to inefficiency, and it might need the tough shell to hold it together (and act as a neutron reflector).
To my understanding, you can’t really do more than bring the parts together in a compact arrangement and keep them like that, so if the demon core would stay together (and not, say, get blown apart by the release of energy), then the issue would be a lack of fissile material (or reflectors), no?
See also an image of a nuclear bomb design (I think Little Boy) from Wikipedia, which illustrates the idea of sliding a rod of fissile material into a hollow cylinder, though the bomb did it in reverse. I think the design might be obsolete due to inefficiency, and it might need the tough shell to hold it together (and act as a neutron reflector).